Commits on May 6, 2024

1. buildscripts: simplify PSM interop Kokoro buildscripts (grpc#11121) …

   Integrates the new features of the the Kokoro PSM Interop install library introduced in grpc/psm-interop#73.
   
   Nearly all common functionality was moved from per-language/per-branch PSM Interop build scripts to [psm_interop_kokoro_lib.sh](https://github.com/grpc/psm-interop/blob/main/.kokoro/psm_interop_kokoro_lib.sh):
   1. The list of tests in the each test suite 
   2. Per-test-suite flag customization
   3. `run_test` methods
   4. `build_docker_images_if_needed` methods
   5. Generic `build_test_app_docker_images` methods (simple docker build + docker push + docker tag). grpc-java is one exception, as it doesn't run docker directly, but a cloudbuild flow.
   
   Now all PSM Interop jobs share the same buildscripts by all test suites:
   1.  buildscript that invokes the test: `psm-interop-test-{language}.sh` (configured as `build_file` in the build cfg)
   2. buildscript that builds the xDS test client/server and publishes them as a Docker image: `psm-interop-build-{language}.sh` (conventional name called from `psm_interop_kokoro_lib.sh`)
   
   `psm-interop-test-{language}.sh`:
   1. Sets `GRPC_LANGUAGE`, `BUILD_SCRIPT_DIR` environment variables.
   2. Downloads the shared `psm_interop_kokoro_lib.sh` from the main branch of the psm-interop repo.
   3. Sources `psm-interop-build-{language}.sh`
   4. Calls `psm::run "${PSM_TEST_SUITE}"` (`PSM_TEST_SUITE` configured in the cfg file).
   
   `psm-interop-build-{language}.sh`:
   1. Defines `psm::lang::build_docker_images` which is called from `psm_interop_kokoro_lib.sh`.
   2. Invokes any repo-specific logic.
   3. May use `psm::build::docker_images_generic` for generic Docker build, tag, push, or provide implement its own build/publish method.
   
   References:
   - b/288578634
   - See the full list of the new features at grpc/psm-interop#73.
   - Additional fixes to the shared lib: grpc/psm-interop#78, grpc/psm-interop#79

   

   sergiitk committed May 6, 2024
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