add info about kubelb tenant defaulting at kkp project level

[soer3n]

This pr adds information about defaulting of kubelb tenants at kkp project level. ref: kubermatic/kubermatic#14819

[csengerszabo]

/lgtm
/approve

[kubermatic-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[kubermatic-bot]

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Mark the issue as fresh with /remove-lifecycle stale.

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[archups]

Suggested change to the reference tenantspec link.
Also since KKP 2.29 release is out, please replicate the content changes in kubermatic/v2.29 directory as well with tenantspec link adjusted to compatible KubeLB version (instead of pointing to main)
Thanks!

[archups]

Suggested change

	The options for configuring default values for a kubelb tenant can be viewed in [kubelb tenant api specification](https://docs.kubermatic.com/kubelb/v1.1/references/ee/#tenantspec).
	The options for configuring default values for a kubelb tenant can be viewed in [kubelb tenant api specification]({{< ref "/kubelb/main/references/ee/#tenantspec" >}}).

[kubermatic-bot]

Issues go stale after 90d of inactivity.
After a furter 30 days, they will turn rotten.
Mark the issue as fresh with /remove-lifecycle stale.

If this issue is safe to close now please do so with /close.

/lifecycle stale