fix: route TLS trust probe through IDE HTTP proxy (CRW-12333)

[adietish]

TlsProbe opened a raw SSLSocket and bypassed IdeHttpProxy, so proxy-only clusters timed out even when Check connection worked. Use the IDE ProxySelector (HTTP CONNECT, Basic on 407) and surface connect failures clearly instead of treating them as trust prompts.

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 70.40816% with 29 lines in your changes missing coverage. Please review.
✅ Project coverage is 34.82%. Comparing base (71098f6) to head (f3f7133).
⚠️ Report is 415 commits behind head on main.

Files with missing lines	Patch %	Lines
...at/devtools/gateway/auth/tls/TlsConnectionProbe.kt	67.85%	11 Missing and 16 partials ⚠️
...evtools/gateway/auth/tls/DefaultTlsTrustManager.kt	83.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            main     #361       +/-   ##
==========================================
+ Coverage   0.00%   34.82%   +34.82%     
==========================================
  Files          4      113      +109     
  Lines         26     4896     +4870     
  Branches       0      941      +941     
==========================================
+ Hits           0     1705     +1705     
- Misses        26     2939     +2913     
- Partials       0      252      +252     

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