Add Secure Links to File Upload and Post Image fields

[jakejackson1]

Description

When displayed in Core PDFs, link to the file using the secure GF link. Also include secure links in the $form_data array.

Checklist:

• [x] I've tested the code.
• [x] My code is easy to read, follow, and understand
• [ ] My code follows the accessibility standards.
• [x] My code has proper inline documentation / docblocks.

Additional Comments

[codecov[bot]]

Codecov Report

Merging #1471 (82d9112) into development (e2f0588) will increase coverage by 17.59%. The diff coverage is n/a.

:exclamation: Current head 82d9112 differs from pull request most recent head 64fd654. Consider uploading reports for the commit 64fd654 to get more accurate results

@@                Coverage Diff                 @@
##             development    #1471       +/-   ##
==================================================
+ Coverage          75.70%   93.30%   +17.59%     
==================================================
  Files                243       57      -186     
  Lines              12851     1464    -11387     
  Branches             370      370               
==================================================
- Hits                9729     1366     -8363     
+ Misses              3114       90     -3024     
  Partials               8        8               

see 186 files with indirect coverage changes