Add --builders to limit number of projects can build concurrently

[sheetalkamat]

Per #1622 (comment)

[Copilot]

Pull request overview

This PR adds support for the --builders command-line flag to limit the number of projects that can build concurrently in TypeScript project builds. The implementation introduces:

• A new --builders option that accepts a numeric value (minimum 1)
• Semaphore-based concurrency control in the build orchestrator
• Validation to ensure the value is greater than or equal to 1
• Test coverage for various scenarios including error cases
• Updated baseline files demonstrating the feature with different project counts

Reviewed changes

Copilot reviewed 26 out of 28 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
internal/core/buildoptions.go	Adds Builders field to BuildOptions struct
internal/tsoptions/declsbuild.go	Declares the --builders command-line option with validation
internal/tsoptions/declscompiler.go	Adds minimum value validation to checkers option
internal/tsoptions/parsinghelpers.go	Adds parsing logic for the builders option
internal/tsoptions/commandlineparser.go	Implements validation for minimum value constraint on numeric options
internal/tsoptions/commandlineoption.go	Adds minValue field to CommandLineOption struct
internal/execute/build/orchestrator.go	Initializes semaphore for limiting concurrent builds
internal/execute/build/buildtask.go	Acquires/releases semaphore slots during compilation
internal/diagnostics/extraDiagnosticMessages.json	Adds diagnostic messages for the feature
internal/diagnostics/diagnostics_generated.go	Generated diagnostic code
internal/execute/tsctests/tscbuild_test.go	Adds test scenarios for the --builders flag
internal/tsoptions/commandlineparser_test.go	Adds validation tests for edge cases
Multiple baseline files	Test output baselines showing expected behavior