[FLINK-19762][Runtime / Web Frontend]Selecting Job-ID and TaskManager-ID in web UI covers more than the ID

[zhuxiaoshang]

What is the purpose of the change

Not only the ID is selected when trying to copy the Job ID from the web UI by double-clicking it
The same thing happens for the TaskManager ID in the corresponding TaskManager Overview page.

Brief change log

• fix double-click on Jod ID/Start Time/End Time/Duration

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

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

• Dependencies (does it add or upgrade a dependency): (no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (no)
• The serializers: (no)
• The runtime per-record code paths (performance sensitive): (no)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (no)
• The S3 file system connector: (no)

Documentation

• Does this pull request introduce a new feature? (no)
• If yes, how is the feature documented? (no)

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Automated Checks

Last check on commit 7c1ad5f (Thu Oct 29 17:02:48 UTC 2020)

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• ❓ 1. The [description] looks good.
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[XComp]

I ran a manual test checking that the UI behaves as expected for the Job-ID and the TaskManager ID. I'm going to add @vthinkxie to check whether he's happy with the code itself.

I'd like you to update the PR info a squash the two commits together as it's a minor feature. Hence, we can merge it into a single commit, I think.

[vthinkxie]

lgtm
good work