[7052] Silence rrweb Posthog errors in Sentry

[n-lark]

Description

See details here.

Related Issue(s)

Resolves #7052

Checklist

• I have read the contribution guidelines
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
  • Upgrade instructions
  • Configuration details
  • Concepts
• Changes flowforge.yml?
  • Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production
• Link to Changelog Entry PR, or note why one is not needed.

Labels

• Includes a DB migration? -> add the area:migration label

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.58%. Comparing base (0b1b0ab) to head (c7671a5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7192   +/-   ##
=======================================
  Coverage   76.58%   76.58%           
=======================================
  Files         405      405           
  Lines       20580    20580           
  Branches     4974     4974           
=======================================
  Hits        15762    15762           
  Misses       4818     4818           

Flag	Coverage Δ
backend	76.58% <ø> (ø)

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