fix: log unexpected GRPC server errors at INFO

[anthony-swirldslabs]

Description:
PbjProtocolHandler.java logs unexpected errors at ERROR level, but in most cases they are harmless for the server itself. ERROR logs trigger various alarms when analyzing logs. So we want to log these at INFO level instead.

Also, I'm ensuring that the error() is called even if sending trailers fails.

Related issue(s):

Fixes #691

Notes for reviewer:
All tests should pass.

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[github-actions]

JUnit Test Report

   78 files  ±0     78 suites  ±0   3m 46s ⏱️ -5s
1 350 tests ±0  1 346 ✅ ±0   4 💤 ±0  0 ❌ ±0 
7 227 runs  ±0  7 207 ✅ ±0  20 💤 ±0  0 ❌ ±0 

Results for commit 8dd306a. ± Comparison against base commit 7060326.

This pull request removes 2 and adds 1 tests. Note that renamed tests count towards both.

, 1
com.hedera.pbj.runtime.Utf8ToolsTest ‑ [4] 

com.hedera.pbj.runtime.Utf8ToolsTest ‑ [4] 
, 1

[jsync-swirlds]

Thanks for the rapid fix on this.

[github-actions]

Integration Test Report

    410 files  ±0      410 suites  ±0   16m 23s ⏱️ - 1m 14s
114 861 tests ±0  114 861 ✅ ±0  0 💤 ±0  0 ❌ ±0 
115 102 runs  ±0  115 102 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 8dd306a. ± Comparison against base commit 7060326.

This pull request removes 3 and adds 3 tests. Note that renamed tests count towards both.

com.hedera.pbj.integration.test.ParserNeverWrapsTest ‑ [1] com.hedera.pbj.integration.test.ParserNeverWrapsTest$$Lambda/0x00007f92d8bb8000@29500b4f
com.hedera.pbj.integration.test.ParserNeverWrapsTest ‑ [2] com.hedera.pbj.integration.test.ParserNeverWrapsTest$$Lambda/0x00007f92d8bb8230@2458b75b
com.hedera.pbj.integration.test.ParserNeverWrapsTest ‑ [3] com.hedera.pbj.integration.test.ParserNeverWrapsTest$$Lambda/0x00007f92d8bb8460@9916cf1

com.hedera.pbj.integration.test.ParserNeverWrapsTest ‑ [1] com.hedera.pbj.integration.test.ParserNeverWrapsTest$$Lambda/0x00007fb4e3bb5328@7564142a
com.hedera.pbj.integration.test.ParserNeverWrapsTest ‑ [2] com.hedera.pbj.integration.test.ParserNeverWrapsTest$$Lambda/0x00007fb4e3bb5558@23419319
com.hedera.pbj.integration.test.ParserNeverWrapsTest ‑ [3] com.hedera.pbj.integration.test.ParserNeverWrapsTest$$Lambda/0x00007fb4e3bb5788@4080079a