Jetpack Forms move method to Util class

[CGastrell]

Related to #43821

Part of FORMS-132

Proposed changes:

This PR moves get_export_filename method from Admin class to Util class, getting things ready to remove Admin class entirely.

Other information:

• Have you written new tests for your changes, if applicable?
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Jetpack product discussion

Does this pull request change what data or activity we track or use?

No

Testing instructions:

Go to Forms dashboard and click on export button, choose CSV. A file should download and no errors occur.

[github-actions]

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[github-actions]

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Code Coverage Summary

Coverage changed in 1 file.

File	Coverage	Δ%	Δ Uncovered
projects/packages/forms/src/contact-form/class-util.php	36/153 (23.53%)	-1.65%	10 💔

Full summary · PHP report · JS report

_{Coverage check overridden by Coverage tests to be added later Use to ignore the Code coverage requirement check when tests will be added in a follow-up PR .}

[edanzer]

1. Looks like but wanted to confirm: we duplicated the method exactly?

2. Do we need to delete this method from the admin class? Or are we not worried about that because we intend to delete the whole class later?

3. Also small question for context: why or what changed that we are planning on deleting the admin class? Is it related to menu changes or some other recent change?

[CGastrell]

It is related somehow. With the legacy view gone, there's no real use for the Admin class.

#43821

FORMS-133

FORMS-132

[edanzer]

Straightforward change and tests as expected. Added a comment with a couple small questions.