fix: refactor docker tag and helm version determination via triggers

[maze88]

Git tag events (regardless of the branch) would not trigger the old workflow, and push branch events would trigger it - including the Helm CI, which would sometimes not be able to determine any version to set, thus failing.

This commit fixes the above, by:

• Add a trigger for pushed tag events.
• Determine docker tags and chart versions based on trigger event type.
• Add conditions to Helm CI job steps, allowing it to be skipped (but not failed!) in cases where it is not required to run (such as an untagged intermediate commits on release branches).

[coveralls]

Pull Request Test Coverage Report for Build 9169939491

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 7 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+0.1%) to 64.181%

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Files with Coverage Reduction	New Missed Lines	%
controllers/nicclusterpolicy_controller.go	1	78.21%
controllers/ipoibnetwork_controller.go	2	83.33%
pkg/state/state_ipoib_network.go	4	75.24%

Totals
Change from base Build 9075384735:	0.1%
Covered Lines:	3254
Relevant Lines:	5070

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💛 - Coveralls

[almaslennikov]

A few nits, otherwise LGTM

[almaslennikov]

(Can do after the merge, just so we don't forget) Need to make a test release to check that all versions in the helm chart / image versions are correct

[e0ne]

CI failures are not related to this change, so it's safe to merge