fix: correct split-repo-post-process.sh regex replacement

[shivanee-p]

This PR fixes a bug in the monorepo's split-repo post-processing script bin/split-repo-post-process.sh which caused newly migrated/split packages to generate duplicate code files inside a literal folder named $1.

Because the capture group in source was removed, the trailing /$1 reference in dest has no capture group to bind to. The regular expression replacement logic was tested under both standard and scoped package scenarios to verify the fix.

[gemini-code-assist]

Code Review

This pull request modifies the bin/split-repo-post-process.sh script to update the destination path in the .OwlBot.yaml configuration file, specifically removing a trailing variable from the destination string. A review comment identifies a potential issue where the gsed command might fail if the package name contains slashes (e.g., scoped packages) and suggests using a different delimiter like | to improve robustness.

[gemini-code-assist]

The gsed command uses / as a delimiter, which will cause the command to fail if ${PACKAGE_NAME} contains a slash (e.g., for scoped packages like @google-cloud/storage). Using a different delimiter such as | is safer when dealing with paths or package names that may contain slashes.

Suggested change

	gsed -i "s/dest: \/owl-bot-staging\/\$1\/\$2/dest: \/owl-bot-staging\/${PACKAGE_NAME}/" "${PACKAGE_PATH}/.OwlBot.yaml"
	gsed -i "s|dest: /owl-bot-staging/\$1/\$2|dest: /owl-bot-staging/${PACKAGE_NAME}|" "${PACKAGE_PATH}/.OwlBot.yaml"