Increase max limit on url_variables token length
What does this MR do and why?
This change sets the new validation limit of a WebHook masked URL variable value to 2048 characters.
This number is intended to support OAuth2 tokens being used as a masked URL variable.
There is no set maximum length for what an OAuth token could be, but the new limit is based on the bytesize of a Google API token, which is an example of a large OAuth2 token size. Tokens are likely to be ASCII.
The current limit of 100 is too short to support Drone CI Oauth2 tokens, and currently, users are unable to save Drone CI integrations.
MR acceptance checklist
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Related to #385919 (closed)