Integrity testing: Check published kickstart files integrity (#5689)

* netdata/packaging/ci: Integrity testing

Introduce a scriptlet that validates kickstart integrity in my-netdata.io against the ones in the repo.
Run this through the pipeline on a scheduled manner.
Will refine the conditionals later, once i verify the stage is built up as expected

* netdata/packaging/ci: remove conditionals first

* netdata/packaging/ci: Adjust the names to something more appropriate. Run it along with nightlies

* netdata/packager/ci: Cleanup checksum validation for kickstart files (continued)

1) merge validate_kickstart_integrity.sh and tests/installer/checksums.sh
2) run checksums at the new point on the pipeline
3) Change that unstable gitignore check and use a more file-agnostic check that depends only on git that we already require
4) Do not run the kickstart validation on the online website everywhere, only on the nightly runs

* netdata/packaging/ci: First rounf of PR feedback adjustments

1) changes wordings as recommended
2) pass file info in parameter and use it in the wordings
3) as shellcheck suggests, use -n instead of ! -z. Makes sense actually, ! -z is kind of reverse logic that confuses

More adjustments on a follow up commit

* netdata/packaging/ci: Enable slack integration for kickstart validation

We want to be notified in a timely manner when the kickstart on the website is outdated.
Added a wrapper for incoming webhooks from slack and instead of failing the build we notify slack

Added a debug message in the end of the script to validate the process which i will remove on a follow up commit

* netdata/packaging/ci: fixes
fix sourcing path
missed the /, this new keyboard is a pain :p

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