Revert "RUM-1002 Implement base64 for imageviews"

[jonathanmos]

This reverts commit 3100b41.
Reverts base64 imageview support due to an issue discovered where the "content image" square size would change between when the image begins to download and finishes downloading remotely (the image is resized for centercrop). We will need to implement wireframe cropping and keep the image at a constant size.

A brief description of the change being made with this pull request.

Motivation

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Additional Notes

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Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[codecov-commenter]

Codecov Report

Merging #1655 (e135321) into release/2.2.0 (c757420) will decrease coverage by 0.06%.
The diff coverage is 100.00%.

@@                Coverage Diff                @@
##           release/2.2.0    #1655      +/-   ##
=================================================
- Coverage          83.86%   83.80%   -0.06%     
=================================================
  Files                456      457       +1     
  Lines              15692    15731      +39     
  Branches            2346     2348       +2     
=================================================
+ Hits               13160    13183      +23     
- Misses              1922     1924       +2     
- Partials             610      624      +14     

Files	Coverage Δ
...adog/android/sessionreplay/SessionReplayPrivacy.kt	100.00% <100.00%> (ø)
...lay/internal/recorder/mapper/EditTextViewMapper.kt	100.00% <100.00%> (ø)
...play/internal/recorder/mapper/ImageButtonMapper.kt	93.55% <100.00%> (ø)

... and 16 files with indirect coverage changes