remove unused workflow

Author: Krastanov

.github/pull_request_template.md

@@ -1,7 +1,3 @@
 Please make sure to leave this PR editable by maintainers of this repo.
 
 Please make sure you have consulted [CONTRIBUTING](https://github.com/JuliaGraphs/Graphs.jl/blob/master/CONTRIBUTING.md)
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-The linter bot might add new commits to your PR (e.g. to take care of formatting issues). Feel free to overwrite these commits. 
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-If the linter bot is the last one to put in a commit, **THE TESTS WILL NOT RUN**. Either lint/format your contributions yourself as described in CONTRIBUTING.md or close&reopen the PR to reset the test runner.