fix: skip webhook regex matching for exp config

[gt2345]

Ticket

MD-435

Description

Skip webhook log regex match for user submitted config.

Test Plan

e2e test should cover it.

Checklist

• Changes have been manually QA'd
• User-facing API changes need the "User-facing API Change" label.
• Release notes should be added as a separate file under docs/release-notes/.
  See Release Note for details.
• Licenses should be included for new code which was copied and/or modified from any external code.

[netlify]

✅ Deploy Preview for determined-ui canceled.

Name	Link
🔨 Latest commit	172f89c
🔍 Latest deploy log	https://app.netlify.com/sites/determined-ui/deploys/666a219041530f0008691c05

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 48.98%. Comparing base (8e9067b) to head (172f89c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9511   +/-   ##
=======================================
  Coverage   48.98%   48.98%           
=======================================
  Files        1238     1238           
  Lines      160522   160524    +2     
  Branches     2784     2784           
=======================================
+ Hits        78633    78635    +2     
  Misses      81714    81714           
  Partials      175      175           

Flag	Coverage Δ
backend	43.85% <33.33%> (+<0.01%)	⬆️
harness	63.87% <ø> (ø)
web	44.13% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
master/internal/logpattern/logpattern.go	57.42% <0.00%> (ø)
master/internal/webhooks/postgres_webhook.go	57.06% <50.00%> (-0.04%)	⬇️

... and 4 files with indirect coverage changes