Fixes #11193 File Uploads don't show target in Activity report

[inietov]

Description

I think the linked issue is not exactly how this needs to works, but let me know what you think:

When uploading a file to an asset, license or user the target is already the entity that 'receives' the file... so if the report says that an Action->upload is happening over an Item->Heidi Emerich of Type->user, that's the target, like this.

Of course that I can repeat the target with this data... but I opted for add a column called File that contains the file that was uploaded, Since the file is already stored in the ActionLog, I just change a little bit the actionlog transformer and the view of the Activity Report. So the column is hidden by default, and can be activated as preferred. Looking now like this:

Fixes #11193

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Test Configuration:

• PHP version: 7.4.16
• MySQL version: 8.0.23
• Webserver version: nginx/1.19.8
• OS version: Debian10

Checklist:

• I have read the Contributing documentation available here: https://snipe-it.readme.io/docs/contributing-overview
• I have formatted this PR according to the project guidelines: https://snipe-it.readme.io/docs/contributing-overview#pull-request-guidelines
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[snipe]

This looks pretty solid to me - thanks!