extensions: add sync functionality

[shwstppr]

Description

This change introduces support for synchronizing extension files across management servers in a clustered environment.

• Adds new syncExtension API to trigger synchronization for a selected extension.
• Implements service to create .tgz archive of the extension directory or selected files.
• Generates signed share URL with HMAC signature and expiry.
• Sends DownloadAndSyncExtensionFilesCommand to peer management servers.
• Handles archive download, staging, and extraction on receiver side.
• Adds Sync Extension action in the UI Extensions view.
• Updates events, logging, and cleanup of temporary share files.

Refactors all filesystem related code to extensions framework layer.
Checksum for extensions is now calculated and compared for all files in
the extension directory.

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• Build/CI
• Test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

(localcloud) 🐱 > sync extension id=3cf82f18-89c5-4acc-8f46-8d42da139f30 sourcemanagementserverid=0d8d73fa-9241-49aa-8d7e-7642f143ce66
{
  "success": true
}
(localcloud) 🐱 > sync extension id=3cf82f18-89c5-4acc-8f46-8d42da139f30
💩 Missing required parameters:  sourcemanagementserverid
(localcloud) 🐱 > sync extension -h
syncExtension: To sync the extension files from one management server to other management server(s)
This API is asynchronous.
Required params: id, sourcemanagementserverid, 
API Params               Type     Description
==========               ====     ===========
files                    list     List of files to sync. Specify absolute o
                                  r relative paths. If not provided, all e
                                  xtension files will be synced.
id                       uuid     ID of the extension
sourcemanagementserverid uuid     ID of the management server from which fi
                                  les are to be synced
targetmanagementserverids list     the IDs of the management servers to whic
                                  h the extension files are to be synced. 
                                  If not specified, the files will be sync
                                  ed to all management servers

How Has This Been Tested?

How did you try to break this feature and the system with this change?

[codecov]

Codecov Report

❌ Patch coverage is 63.72549% with 370 lines in your changes missing coverage. Please review.
✅ Project coverage is 17.62%. Comparing base (b99a030) to head (ecbdcd6).

Files with missing lines	Patch %	Lines
...extensions/manager/ExtensionsShareManagerImpl.java	67.54%	73 Missing and 26 partials ⚠️
...sions/manager/ExtensionsFilesystemManagerImpl.java	66.31%	65 Missing and 32 partials ⚠️
.../main/java/org/apache/cloudstack/ServerDaemon.java	0.00%	63 Missing ⚠️
...work/extensions/manager/ExtensionsManagerImpl.java	66.87%	29 Missing and 25 partials ⚠️
.../cloudstack/utils/server/ServerPropertiesUtil.java	32.65%	31 Missing and 2 partials ⚠️
...va/org/apache/cloudstack/ShareSignedUrlFilter.java	79.48%	3 Missing and 5 partials ⚠️
...nsions/command/StartSyncExtensionFilesCommand.java	36.36%	6 Missing and 1 partial ⚠️
...ework/extensions/command/ExtensionBaseCommand.java	25.00%	3 Missing ⚠️
...ack/framework/extensions/api/SyncExtensionCmd.java	94.59%	0 Missing and 2 partials ⚠️
.../command/DownloadAndSyncExtensionFilesCommand.java	96.00%	0 Missing and 1 partial ⚠️
... and 3 more

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #11814      +/-   ##
============================================
+ Coverage     17.56%   17.62%   +0.06%     
- Complexity    15500    15629     +129     
============================================
  Files          5899     5910      +11     
  Lines        527793   528802    +1009     
  Branches      64479    64571      +92     
============================================
+ Hits          92714    93224     +510     
- Misses       424653   425077     +424     
- Partials      10426    10501      +75     

Flag	Coverage Δ
uitests	3.59% <ø> (-0.01%)	⬇️
unittests	18.69% <63.72%> (+0.06%)	⬆️

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[shwstppr]

@blueorangutan package

[blueorangutan]

@shwstppr a [SL] Jenkins job has been kicked to build packages. It will be bundled with KVM, XenServer and VMware SystemVM templates. I'll keep you posted as I make progress.

[blueorangutan]

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ el10 ✔️ debian ✔️ suse15. SL-JID 15401