Cherrypick bugfix: fix many small bugs in activity actor and activity formatting

[mna]

Cherry-pick of #26779 in the 4.65.0 RC.

[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-v4.65.0   #26784   +/-   ##
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  Coverage                          ?   63.99%           
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  Files                             ?     1694           
  Lines                             ?   161498           
  Branches                          ?     4299           
=========================================================
  Hits                              ?   103345           
  Misses                            ?    50129           
  Partials                          ?     8024           

Flag	Coverage Δ
frontend	54.52% <100.00%> (?)

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[qa-wolf]

E2E tests

• Last commit: 397a8ea
• Last tested commit: 397a8ea

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Results

Running	Status	Preview	Started	Run time	Est. dev time saved
58 workflows	Done (Details)	Visit preview	Mar 4, 2025 at 12:14 PM (UTC)	9 minutes	~18.33 hrs
174 workflows	In review (Details)	Visit preview	Mar 4, 2025 at 12:14 PM (UTC)

Latest run

⚠️ 7 failed - your wolf pack is investigating

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Preexisting bugs

7 Blocking bugs

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• "Manage Automations" dropdown not visible as admin [REOPENED]

• [Premium] Maintainer account is able to Manage Automations

• Number of Pending hosts displays zero

• Unable to disable automations for other workflows

• [REOPENED] No Vulnerabilities

• Unable to update host affected host count with command [REOPENED]

• [REOPENED] Incorrect count for filter hosts by low disk space

0 Non-blocking bugs