Avoid unintentionally canceling the scheduled crate publishing job (#13088)

* avoid unintentionally canceling the scheduled crate publishing job

because publish-crates and publish-crates-manual share the resource group
"crates-publishing", any instance of publish-crates-manual cancels a running
instance of publish-crates, as demonstrated by
https://gitlab.parity.io/parity/mirrors/substrate/-/jobs/2212179



a workaround for that unintended interaction is to avoid creating instances of
publish-crates-manual and instead require pipelines to be triggered manually by
checking $CI_JOB_MANUAL == "true"

* check manual pipelines by $CI_PIPELINE_SOURCE instead of $CI_JOB_MANUAL

* make crate-publishing pipelines uninterruptible

* use conditional includes to work around interruptible limitations

* organize comments

* remove interruptible from common pipeline

* wip: check include

* wip: check include

* fix include

* fix include

* fix include

* fix yaml

* fix yaml

* remove shared common-pipeline

* wip: retry common-pipeline

* move .default-template to .gitlab-ci.yml

* fix the pipeline

add comments

* fix default-pipeline.yml

* revert publish-crates-manual to when: manual

* move "needs:" back to publish-crates

* avoid manual repetition

* improve previous commit

* try to avoid manual repetition

* fix indentation

* minor adjustments

* move defaults to top of .gitlab-ci.yml

* fix positioning on default in the diff

* comments

* indentation

* Apply suggestions from code review

Co-authored-by: Alexander Samusev <[email protected]>

Co-authored-by: Alexander Samusev <[email protected]>