Fix 951 skip ca tls

[Samriddha9619]

What problem does this PR solve?

Issue Number: close #951

Problem Summary:
Issue - 951

What is changed and how it works:
Removed the early return in buildClientConfig and BuildClientTLSConfig to ensure the full TLS config (with certificate hooks) is built even when CA verification is skipped.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Notable changes

• Has configuration change
• Has HTTP API interfaces change
• Has tiproxyctl change
• Other user behavior changes

Release note

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None

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[ti-chi-bot]

Hi @Samriddha9619. Thanks for your PR.

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