ci: add workflow_dispatch trigger to functions workflow

[Ankitsinghsisodya]

Closes #3633

Summary

• Adds workflow_dispatch trigger to the Functions CI workflow
• Enables manual reruns directly from the GitHub Actions UI without requiring a code push or new pull request

Test plan

• Verify the workflow appears with a "Run workflow" button in the Actions tab after merge

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Ankitsinghsisodya
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[knative-prow]

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[Copilot]

Pull request overview

Adds a manual trigger to the existing “Functions” GitHub Actions workflow so it can be run on-demand from the Actions UI, aligning it with other workflows in this repo that already support workflow_dispatch.

Changes:

• Add workflow_dispatch to .github/workflows/functions.yaml triggers to enable manual runs.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.46%. Comparing base (7247657) to head (d8ef7ce).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3630      +/-   ##
==========================================
+ Coverage   56.33%   58.46%   +2.12%     
==========================================
  Files         180      180              
  Lines       20571    20572       +1     
==========================================
+ Hits        11589    12027     +438     
+ Misses       7780     7344     -436     
+ Partials     1202     1201       -1     

Flag	Coverage Δ
e2e	39.64% <ø> (+3.43%)	⬆️
e2e go	32.36% <ø> (-0.50%)	⬇️
e2e node	28.11% <ø> (-0.51%)	⬇️
e2e python	32.72% <ø> (-0.51%)	⬇️
e2e quarkus	28.27% <ø> (-0.50%)	⬇️
e2e rust	27.65% <ø> (-0.54%)	⬇️
e2e springboot	26.15% <ø> (-0.50%)	⬇️
e2e typescript	28.23% <ø> (-0.50%)	⬇️
e2e-config-ci	17.55% <ø> (-0.51%)	⬇️
integration	17.07% <ø> (-0.51%)	⬇️
unit macos-14	42.69% <ø> (-0.63%)	⬇️
unit macos-latest	42.69% <ø> (-0.62%)	⬇️
unit ubuntu-24.04-arm	43.51% <ø> (ø)
unit ubuntu-latest	43.51% <ø> (-0.68%)	⬇️
unit windows-latest	42.71% <ø> (-0.63%)	⬇️

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