Set default values for head_sha and repo_url in generate_typespec_project

[Copilot]

Changes

Updated generate_typespec_project() function signature in eng/automation/generate_utils.py to provide sensible defaults:

• head_sha: "" → "HEAD"
• repo_url: "" → "Azure/azure-rest-api-specs"

Result

Callers can now omit these parameters when generating from the default specs repo at HEAD:

# Before: required explicit empty strings or values
generate_typespec_project(tsp_project, sdk_root, spec_root, "", "")

# After: can omit when using defaults
generate_typespec_project(tsp_project, sdk_root, spec_root)

# Explicit values still override defaults
generate_typespec_project(tsp_project, sdk_root, spec_root, "abc123", "MyOrg/my-specs")

Existing callers with explicit parameters are unaffected.

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[weidongxu-microsoft]

tsp-client will report error if they are empty, even though it works in "local" mode

Error reading tsp-location.yaml: Error: Invalid tsp-location.yaml, missing required fields: directory, commit, repo

This is for dev use in local for iteration, where they won't need to provide a commit SHA.

[Copilot]

Pull request overview

This PR updates eng/automation/generate_utils.py to make generate_typespec_project() easier to call for the common case of generating from Azure/azure-rest-api-specs at HEAD, by providing non-empty default values for head_sha and repo_url.

Changes:

• Changed generate_typespec_project() default head_sha from "" to "HEAD".
• Changed generate_typespec_project() default repo_url from "" to "Azure/azure-rest-api-specs".

[weidongxu-microsoft]

/check-enforcer override