[FLINK-39707] Update flink-connector-parent to 2.0.0

[mukul-8]

What is the purpose of the change

Update flink-connector-parent from 1.1.0 to 2.0.0.

Brief change log

• Updated parent POM version from 1.1.0 to 2.0.0
• Updated japicmp-maven-plugin groupId from io.github.zentol.japicmp to com.github.siom79.japicmp (aligned with new parent)
• Updated checkstyle.xml to use properties compatible with newer Checkstyle version (replaced deprecated properties)
• Updated archunit-violations baselines to reflect changes in the new parent

Verifying this change

This change is a dependency version bump. Verified by building the project successfully.

Does this pull request potentially affect one of the following parts?

• Dependencies (does it add or upgrade a dependency): yes
• The public API: no
• The runtime per-record code paths (performance sensitive): no

Documentation

• Does this pull request introduce a new feature? no

[boring-cyborg]

Thanks for opening this pull request! Please check out our contributing guidelines. (https://flink.apache.org/contributing/how-to-contribute.html)

[mukul-8]

@chesnay @reta Could you please approve the CI workflow and review this change? This is a dependency maintenance improvement — updating to the latest connector parent — and would be a good fit before the next release. Thanks!

[reta]

@chesnay @reta Could you please approve the CI workflow and review this change? This is a dependency maintenance improvement — updating to the latest connector parent — and would be a good fit before the next release. Thanks!

I sadly cannot, @snuyanzin could you please help here? Thank you!

[snuyanzin]

started

[mukul-8]

@snuyanzin Could you please re-approve the CI workflow? I force-pushed to fix missing Apache license headers in two files (pre-existing issue now caught by the new parent's stricter RAT config). Thanks!

https://github.com/apache/flink-connector-opensearch/actions/runs/26096942370/job/76749795483

[mukul-8]

Added a commit to fix spotless formatting violations — the new parent's upgraded spotless (2.43.0 with google-java-format 1.24.0) requires a blank line before Javadoc comments. Pre-existing issue in 3 files, not caught locally because spotless is
disabled on JDK 21 (CI runs JDK 11).

[mukul-8]

@snuyanzin Could you please re-approve the CI workflow? @reta can you help with review
I've squashed all fixes into a single commit — parent upgrade, license headers, spotless formatting, checkstyle config update, and removed the now-redundant JDK-21 spotless profile (parent 2.0.0 handles it). Verified locally with both JDK 17 and JDK 21. Thanks!

[reta]

Thanks @mukul-8 !

[mukul-8]

@reta thanks for the review! @snuyanzin thanks for helping with CI approvals. Could you please merge this when you get a chance? Thanks!