fix: Remove trailing whitespace in *.ts

[notpeter]

Currently a couple typescript files include trailing whitespace. This makes committing generated js output (necessary for github actions) also have trailing whitespace. Yucky. (example)

Separately, oidc-utils.ts and path-and-artifact-name-validation.ts have trailing whitespace inside template strings used for error strings. This means that both the source has unnecessary trailing whitespace AND the error strings include trailing whitespace and doubled newlines. Double (triple?) yucky.

I think someone misunderstood how newlines / leading whitespace / trailing whitespace in template literals worked.

Before:

Failed to get ID Token. 
 
        Error Code : ${error.statusCode}
 
        Error Message: ${error.message}

After:

Failed to get ID Token.
  Error Code : ${error.statusCode}
  Error Message: ${error.message}