fix: add field value to mixed case notice

[briandonahue]

Summary:

Closes #1392

Add field value to notice. Note, does not change casing of filename field as everywhere else is using the lowercase version.

Expected behavior:

Should show the offending value.

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[github-actions]

This contribution does not follow the conventions set by the Google Java style guide. Please run the following command line at the root of the project to fix formatting errors: ./gradlew goJF.

[briandonahue]

Leaving this as a draft for now as it has some uncommitted changes that will be added in another PR, that will fix #1394

[github-actions]

✅ Rule acceptance tests passed.
New Errors: 0 out of 1425 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Errors: 0 out of 1425 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
New Warnings: 0 out of 1425 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Warnings: 0 out of 1425 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
0 out of 1425 sources (~0 %) are corrupted.
Commit: b448bef
Download the full acceptance test report here (report will disappear after 90 days).
✅ Rule acceptance tests passed.

[briandonahue]

@isabelle-dr since that bug is resolved, this is ready for review. Let me know your thoughts on the filename casing as mentioned here

[isabelle-dr]

Will have a look shortly, thank you.
We'll also need a review from @davidgamez :)

[briandonahue]

@davidgamez I think this is fixed now. I think I had to pull in some of Kevin's changes to fix an issue I was having, but then afterward could not replicate the issue, so now I've removed the changes, and this should just be the original PR changes.

[github-actions]

✅ Rule acceptance tests passed.
New Errors: 0 out of 1426 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Errors: 0 out of 1426 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
New Warnings: 0 out of 1426 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Warnings: 0 out of 1426 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
0 out of 1426 sources (~0 %) are corrupted.
Commit: 8f4101c
Download the full acceptance test report here (report will disappear after 90 days).
✅ Rule acceptance tests passed.

[davidgamez]

@davidgamez I think this is fixed now. I think I had to pull in some of Kevin's changes to fix an issue I was having, but then afterward could not replicate the issue, so now I've removed the changes, and this should just be the original PR changes.

Great, thanks! Approving now!