[clr-interp] Enhance InterpMode and CI testing

[davidwrighton]

• Enhance InterpMode flag to autoimply various other flags like ReadyToRun=0 EnableHWIntrinsic=0 consistently, so that InterpMode can be used on its own to control interpretation behavior
  • The comments around InterpMode are now accurate as to what they imply
• Enhance CI to allow testing of various interpreter scenarios (The existing model + InterModes 1, 2, and 3)

[Copilot]

Pull Request Overview

This PR enhances the InterpMode configuration flag to automatically imply related settings (ReadyToRun=0, EnableHWIntrinsic=0) and expands CI testing to cover multiple interpreter scenarios (InterpMode 1, 2, and 3) in addition to the existing test model.

Key Changes:

• InterpMode now auto-configures dependent flags (ReadyToRun, EnableHWIntrinsic, vector widths) based on mode value
• CI infrastructure updated to test InterpMode scenarios 1-3 with various tiered compilation settings
• Test execution scripts enhanced to detect and skip interpreter-incompatible tests when DOTNET_InterpMode is set

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/tests/Common/testenvironment.proj	Adds InterpMode to environment variables and defines six new test scenarios for interpreter modes 1-3 with/without tiered compilation
src/tests/Common/CLRTest.Execute.Batch.targets	Adds Windows batch script logic to skip interpreter-incompatible tests when DOTNET_InterpMode is set and conditionally sets DOTNET_Interpreter
src/tests/Common/CLRTest.Execute.Bash.targets	Adds Bash script logic to skip interpreter-incompatible tests when DOTNET_InterpMode is set and conditionally sets DOTNET_Interpreter
src/coreclr/vm/jitinterface.cpp	Simplifies interpreter loading logic by consolidating config checks into EnableInterpreter()
src/coreclr/vm/jithost.cpp	Adds special handling for EnableHWIntrinsic config queries to respect EEConfig settings
src/coreclr/vm/eeconfig.h	Declares enableInterpreter and enableHWIntrinsic fields and their accessor methods
src/coreclr/vm/eeconfig.cpp	Implements InterpMode auto-configuration logic: sets enableInterpreter, disables ReadyToRun for modes 2+, and disables HWIntrinsic for mode 3
src/coreclr/vm/codeman.cpp	Updates CPU info setup to respect EnableHWIntrinsic config and constrains vector widths to 128 bits for InterpMode 3
src/coreclr/interpreter/eeinterp.cpp	Updates comments describing InterpMode values to accurately reflect implied settings
eng/pipelines/common/templates/runtimes/run-test-job.yml	Configures CI to run interpreter test scenarios, with reduced coverage for PRs

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[janvorli]

LGTM, thank you!

[davidwrighton]

/ba-g Libraries_NET481 build failure is fixed by #120991 and is not related to this change.