Use plugin bom more widely

[MarkEWaite]

Use plugin bom more widely

parameterized-trigger now managed by bom

conditional-buildstep not needed as a dependency

maven plugin now mannaged by bom

Needs to be verified in the plugin bill of materials before it is merged. Previous attempts to remove the conditional-buildstep dependency passed tests in the git plugin but failed in the bill of materials when the maven plugin was being loaded.

Checklist

• I have read the CONTRIBUTING doc
• I have referenced the Jira issue related to my changes in one or more commit messages
• I have added tests that verify my changes
• Unit tests pass locally with my changes
• I have added documentation as necessary
• No Javadoc warnings were introduced with my changes
• No spotbugs warnings were introduced with my changes
• Documentation in README has been updated as necessary
• Online help has been added and reviewed for any new or modified fields
• I have interactively tested my changes
• Any dependent changes have been merged and published in upstream modules (like git-client-plugin)

Types of changes

• Tests