Add workflow_dispatch for local testing and fix PR triggers

[waleed7715]

Fixes #

Proposed Changes

• Fixed duplicate workflow runs on PRs
• Added workflow_dispatch for manual workflow testing

Any background context you want to provide?

Checklist

Not all points below apply to all pull requests.

• I have added a new feature and have added tests to go along with it.
• I have fixed a bug and have added a regression test.
• I have added a test using random numbers; I have made sure it uses a seed, and that random numbers generated are valid inputs for the tests.

[StellarBot]

Can one of the admins verify this patch?

[hkaiser]

LGTM, thanks!