fix(azure_fw): add regexp to grok

[JulienOrain]

Proposed commit message

fix(azure_fw): add regexp to grok

This add allows to match following messages :

UDP request from X.X.X.X:xxxx to X.X.X.X:xxxx. Action: Allow.. Rule Collection: YYYY. Rule: ZZZ

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.
• I have verified that any added dashboard complies with Kibana's Dashboard good practices

Author's Checklist

• [ ]

How to test this PR locally

Related issues

Screenshots

[elasticmachine]

Pinging @elastic/security-service-integrations (Team:Security-Service Integrations)

[efd6]

Is this fixing a bug? If so, please describe the issue in the proposed commit message. If it's an enhancement say there why it is important.

Please add a changelog entry and update the package's version number in the manifest (bump patch for a bugfix and minor for an enhancement).

[botelastic]

Hi! We just realized that we haven't looked into this PR in a while. We're sorry! We're labeling this issue as Stale to make it hit our filters and make sure we get back to it as soon as possible. In the meantime, it'd be extremely helpful if you could take a look at it as well and confirm its relevance. A simple comment with a nice emoji will be enough :+1. Thank you for your contribution!

[JulienOrain]

covered by #13882