[OPS 292] Add labels to the resulting images

[alourie]

Description

Some rework of the pipeline creation:

• Variables are renamed to make their purpose clear - especially the container tags vs container labels.
• Unnecessary payload values used in dispatching the pipeline-java-ewb build are removed.
• Made the dispatching of the pipeline-java-ewb container optional predicated on selecting a checkbox.

Associated tasks

• [OPS 293] multiversion maven repo ewb-super-pom#53

Test Steps

I've built containers from this branch manually to test they actually build, and labelled correctly.

Checklist

If any of these are not applicable, strikethrough the line ~like this~. Do not delete it!. Let the reviewer decide if you should have done it.

Code

• I have performed a self review of my own code (including checking issues raised when creating the PR).
  - [ ] I have added/updated unit tests for these changes, and if not I have explained why they are not necessary.
• I have commented my code in any hard-to-understand or hacky areas.
  - [ ] I have handled all new warnings generated by the compiler or IDE.
• I have rebased onto the target branch (usually main).

Documentation

• I have updated the changelog.
• I have updated any documentation required for these changes.

Breaking Changes

• I have considered if this is a breaking change and will communicate it with other team members if so.

Not a breaking change.

[ryanjcoleman]

Task linked: OPS-292 Update ci-utils pipeline builds with new label information, including sha and tag.

[alourie]

I'd like to get these things merged so we can move on with our [hopefully better] lives.
This is the first step to improve the superpom-based-cache pipeline container image.

[charlta]

LGTM, but I have no ability to check if this actually works