RFR: 7765: Bump some Maven plugins [v2]

[Christoph Langer]

> Several maven plugins should be updated to a more current version. 
> 
> Here's a list with some reasoning:
> junit 4.13.1 -> 4.13.2 (minor update)
> maven javadoc 3.2.0 -> 3.3.2 (bugfixes, e.g. support javadoc generation with modular JDKs)
> mockito 3.7.7 -> 3.12.4 (bugfixes to support newer JDKs, e.g. 17)
> tycho 2.5.0 -> 2.7.1 (bugfixes, prepare JDK17 support)
> jetty maven plugin 9.4.43.v20210629 -> 9.4.46.v20220331 (minor updates, only used for p2 server during build)
> p2-maven-plugin 1.5.0 -> 2.0.0 (prepare JDK 17 support)
> build-helper-maven-plugin 3.2.0 -> 3.3.0 (minor update)
> 
> To support latest tycho, I added a directive to ignore tycho-consumer-pom.xml to .gitignore. These files seem to be generated by the new tycho version.
> 
> I also had to make a small adaption to application/org.openjdk.jmc.feature.pde/feature.xml to overcome https://github.com/eclipse/tycho/issues/876
> 
> In core/tests/pom.xml I removed the entry for maven.javadoc.version since it is inherited from the parent pom.

Christoph Langer has updated the pull request incrementally with one additional commit since the last revision:

  Also update build-helper-maven-plugin and update copyright headers

-------------

Changes:
  - all: https://git.openjdk.java.net/jmc/pull/395/files
  - new: https://git.openjdk.java.net/jmc/pull/395/files/de4b508d..714c37b1

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=395&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=395&range=00-01

  Stats: 7 lines in 5 files changed: 0 ins; 1 del; 6 mod
  Patch: https://git.openjdk.java.net/jmc/pull/395.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/395/head:pull/395

PR: https://git.openjdk.java.net/jmc/pull/395