ci(github): add integration test support to build pipelines

[ncipollina]

Summary

• Added integrationTestSolution input to build-deploy.yaml to support running integration tests after the CDK deploy step
• Updated all dotnet test steps in pr-build.yaml to conditionally pass the solution input, enabling scoped test runs when multiple solution files exist at the root
• Updated the Test Code step in build-deploy.yaml with the same solution-aware pattern

Changes

pr-build.yaml

• All three test steps (Test Code, Test Code with Legacy Coverage, Test Code with MTP Coverage) now pass $solution to dotnet test when provided, falling back to the default discovery behavior when omitted

build-deploy.yaml

• New integrationTestSolution input (optional)
• Compute Build Flags now sets NEEDS_DOTNET=true when integrationTestSolution is provided
• Test Code step updated to conditionally pass solution
• Added Restore Integration Test Dependencies and Run Integration Tests steps after CDK deploy, both gated on integrationTestSolution != ''

Reviewer Notes

• Integration tests only run in build-deploy (post-deploy), not in pr-build — intentional, as integration tests require a live environment
• The ${SOLUTION:+"$SOLUTION"} pattern expands to the solution path when set, and to nothing when empty — preserves existing behavior for repos with a single solution at the root

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