Run used-defined function in provided scheduler rather than in pc-pool thread

[yevheniisemenov]

This contribution fixes the issue described here #793

Checklist

• Documentation (if applicable)
• Changelog

[cla-assistant]

All committers have signed the CLA.

[rkolesnev]

/sem-approve

[rkolesnev]

Hi @yevheniisemenov - thanks for the fix.
Can you please do couple of housekeeping updates to the PR

• update the license header in changed files to 2024 - or alternatively run mvn license:format.
• update changelog and regenerate Readme - for changelog its Changelog.md in the root.
• run mvn asciidoc-template:build to incorporate the updated changelog into generated Readme.

Cheers

[rkolesnev]

I've merged this change to a branch and added required Changelog / Readme / license header updates there.
Superseded by #798.

[yevheniisemenov]

@rkolesnev, thanks for the review!