chore: debug for deep-preserve logic

[diegomarquezp]

The following problem has been observed in googleapis/java-bigquerystorage@96aa207

• patterns starting with "/google-cloud..." only prevent deep-remove from affecting these folders
• patterns starting with "/owl-bot-staging/.*" only prevent deep-copy from skipping these files.

In other words, /google.* basically prevents the matching files from being removed when cleaning up the repository. Later, when bringing the new generated files they may still be overridden if we don't have a similar pattern starting with /owl-bot-staging/v.*/... (that's the deep-copy part).

Using this debug branch we got:

***
source path: google/cloud/bigquery/storage/v1/generated-java/gapic-google-cloud-library/src/main/resources/META-INF/native-image/com.google.cloud.bigquery.storage.v1/reflect-config.json
full source path: /tmp/tmp.xidQiFQjW3/google/cloud/bigquery/storage/v1/generated-java/gapic-google-cloud-library/src/main/resources/META-INF/native-image/com.google.cloud.bigquery.storage.v1/reflect-config.json
rel path /owl-bot-staging/v1/google-cloud-bigquerystorage/src/main/resources/META-INF/native-image/com.google.cloud.bigquery.storage.v1/reflect-config.json
***
Excluding /owl-bot-staging/v1/google-cloud-bigquerystorage/src/main/resources/META-INF/native-image/com.google.cloud.bigquery.storage.v1/reflect-config.json.
wont copy /owl-bot-staging/v1/google-cloud-bigquerystorage/src/main/resources/META-INF/native-image/com.google.cloud.bigquery.storage.v1/reflect-config.json
***

Additionally, some manual testing confirmed the deep-preserve needs a different pattern starting with owl-bot-staging in order to prevent replacements:

Welcome to Node.js v20.19.2.
Type ".help" for more information.
> const relPath = '/owl-bot-staging/v1/google-cloud-bigquerystorage/src/main/resources/META-INF/native-image/com.google.cloud.bigquery.storage.v1/reflect-config.json'
undefined
> const exclude = '/^\/google-cloud-bigquerystorage\/src\/main\/resources\/META-INF\/native-image\//'
undefined
> relPath.test(exclude)
Uncaught TypeError: relPath.test is not a function
> const regex = new RegExp(exclude)
undefined
> regex.test(relPath)
false