fix: make clients use always send auth info

[oh2024]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) Bug fix

• What is the current behavior? (You can also link to an open issue here) Clients need a flag to enable BRPC authentication and send tokens. This causes a problem for the java sdk which cannot set GFLAGS to enable auth

• What is the new behavior (if this is a feature change)? Clients always send brpc auth tokens. Servers validate tokens or not based on the skip grant tables flag

[github-actions[bot]]

SDK Test Report

102 files  102 suites   2m 13s :stopwatch: 357 tests 343 :white_check_mark: 14 :zzz: 0 :x: 483 runs  469 :white_check_mark: 14 :zzz: 0 :x:

Results for commit b3495a3f.

:recycle: This comment has been updated with latest results.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 75.16%. Comparing base (d9bb344) to head (b3495a3). Report is 1 commits behind head on main.

Files	Patch %	Lines
src/auth/brpc_authenticator.cc	50.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3906 +/- ## ============================================ + Coverage 74.98% 75.16% +0.18% Complexity 658 658 ============================================ Files 751 751 Lines 135067 135059 -8 Branches 1501 1979 +478 ============================================ + Hits 101276 101517 +241 + Misses 33503 33254 -249 Partials 288 288 ```

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[github-actions[bot]]

Linux Test Report

    59 files     252 suites   1h 43m 31s :stopwatch: 13 509 tests 13 502 :white_check_mark: 7 :zzz: 0 :x: 19 181 runs  19 174 :white_check_mark: 7 :zzz: 0 :x:

Results for commit b3495a3f.

:recycle: This comment has been updated with latest results.