Update gitops exceptions message for 4.84

[sgress454]

Related issue: Resolves #43461

Note this is a PR directly to 4.84 as the message contains 4.84-specific language that will be adjusted for 4.85 (all errors will look more like the "software" one, not mentioning defaults etc.)

Checklist for submitter

If some of the following don't apply, delete the relevant line.

• Changes file added for user-visible changes in changes/, orbit/changes/ or ee/fleetd-chrome/changes.
  See Changes files for more information.
  n/a, unreleased

Testing

• Added/updated automated tests
• QA'd all new/changed functionality manually

Did ~/Development/fleet$ ./build/fleetctl gitops -f /tmp/test-ex-msg/fleets/💻-workstations.yml with various settings:

Labels:

Error: Starting in 4.84, labels management in GitOps is turned off by default.  Either remove `labels:` from your GitOps file or disable the exception in the UI: https://localhost:8080/settings/integrations/change-management

Secrets

Error: Starting in 4.84, secrets management in GitOps is turned off by default.  Either remove `secrets:` from your GitOps file or disable the exception in the UI: https://localhost:8080/settings/integrations/change-management

Software

Error: Software is excepted from GitOps management. Either remove `software:` from your GitOps file or disable the exception in the UI: https://localhost:8080/settings/integrations/change-management

For unreleased bug fixes in a release candidate, one of:

• Confirmed that the fix is not expected to adversely impact load test results

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@                    Coverage Diff                    @@
##             rc-minor-fleet-v4.84.0   #43471   +/-   ##
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  Coverage                          ?   66.85%           
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  Files                             ?     2579           
  Lines                             ?   207092           
  Branches                          ?     9243           
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  Hits                              ?   138461           
  Misses                            ?    56028           
  Partials                          ?    12603           

Flag	Coverage Δ
backend	68.62% <100.00%> (?)

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