Update licensegen to output the current year for new files

[Waldeedle]

What changed?

• Update licensegen to output the current year for new files
• Removed isFileAutogenerated call since there is no logic in that method anymore as of Update LICENSE file and all go files with new license header #285

Why?

To resolve #5553, users currently have to manually update the year and reviewers need to keep that context in mind when its a fairly straightforward automation.

How did you test it?

created a new .go file without a header and ran the make copyright command

Potential risks

Nothing

Documentation

Not applicable to the enhancement

Is hotfix candidate?

No

[CLAassistant]

All committers have signed the CLA.

[Waldeedle]

I decided to also add a linting step as part of the pipeline to ensure that a missing license is automatically flagged for new go files.

[Waldeedle]

Tested the linting with this example PR: Waldeedle#2
First I didn't have any licensing information, then I updated the licensing information to be the wrong year.
The linting step caught both cases.