Adding a workflow to append preview links for flows in a PR

[mehaase]

This first commit is just playing around with the github-script and message formatting.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (4225fea) 99.64% compared to head (311a421) 99.64%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #117 +/- ## ======================================= Coverage 99.64% 99.64% ======================================= Files 9 9 Lines 837 837 ======================================= Hits 834 834 Misses 3 3 ```

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[github-actions[bot]]

Open this PR's flows in Attack Flow Builder:

• Maastricht University Ransomware.afb

[github-actions[bot]]

Open this PR's flows in Attack Flow Builder:

• Test flow.afb

[github-actions[bot]]

Open this PR's flows in Attack Flow Builder:

• Test flow.afb

[github-actions[bot]]

Open this PR's flows in Attack Flow Builder:

• Test flow.afb

[github-actions[bot]]

Open this PR's flows in Attack Flow Builder:

• Test flow.afb

[github-actions[bot]]

Open this PR's flows in Attack Flow Builder:

• Test flow.afb

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

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