HeterogeneousCore/SonicTriton: add RetryActionDiffServer; expose connectToServer; update tests

[trevin-lee]

Title

HeterogeneousCore/SonicTriton: add RetryActionDiffServer; expose connectToServer; update tests

Body

PR description

• Add RetryActionDiffServer to switch to an alternative Triton server upon failure.
• Expose TritonClient::connectToServer(std::string url) and add a testing constructor to enable unit tests.
• Update BuildFile.xml; remove obsolete tritonRetryActionTest_cfg.py.
• Expected physics/output changes: none in nominal operation; only affects behavior on retry path.
• Builds on the retry framework work (related: fastmachinelearning/cmssw#19).

PR validation

• Builds in CMSSW_15_0_0_pre3 (scram b -j).
• New retry action compiles; SonicTriton tests continue to pass.
• Manually exercised retry by providing an alternative server URL; logs show server switch and successful inference.
• No changes observed in nominal outputs.

Backport

• Not a backport.

Reviewers: @jmduarte @kpedro88

[kpedro88]

Preliminary comments:

1. do you mean 15_1_0_pre3? (not 15_0)
2. there are a few outstanding review comments on @kakwok's PR that should be addressed: Test PR for new Retry Framework #19 (review)

[trevin-lee]

Title

HeterogeneousCore/SonicTriton: add RetryActionDiffServer; expose connectToServer; update tests

Body

PR description

• Add RetryActionDiffServer to switch to an alternative Triton server upon failure.
• Expose TritonClient::connectToServer(std::string url) and add a testing constructor to enable unit tests.
• Update BuildFile.xml; remove obsolete tritonRetryActionTest_cfg.py.
• Expected physics/output changes: none in nominal operation; only affects behavior on retry path.
• Builds on the retry framework work (related: fastmachinelearning/cmssw#19).

PR validation

• Builds in CMSSW_15_0_0_pre3 (scram b -j).
• New retry action compiles; SonicTriton tests continue to pass.
• Manually exercised retry by providing an alternative server URL; logs show server switch and successful inference.
• No changes observed in nominal outputs.

Backport

• Not a backport.

Reviewers: @jmduarte @kpedro88

Superseded by new PR targeting 15_1_0_pre3: #22
Removes altServer* params; uses TritonService registry via TritonClient::updateServer(TritonService::Server::fallbackName)
Moves tests to HeterogeneousCore/SonicTriton/test with proper Catch2 setup; extends tritonTest_cfg.py with --retryAction {same,diff} and a log check
Adds protected default TritonClient ctor for unit testing
Closing this PR; please continue review on the new one.