RUM-3180: Avoid crash when applicationContext is null

[jonathanmos]

What does this PR do?

If applicationContext is null when performing createImageWireframe, then log the view to telemetry and return null from the method

Motivation

Fixes issue where a NPE crash was seen on applicationContext

Additional Notes

Anything else we should know when reviewing?

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 #1864 (cf58dc5) into develop (659c865) will decrease coverage by 0.25%.
Report is 2 commits behind head on develop.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1864      +/-   ##
===========================================
- Coverage    83.72%   83.47%   -0.25%     
===========================================
  Files          470      470              
  Lines        16629    16603      -26     
  Branches      2499     2495       -4     
===========================================
- Hits         13922    13859      -63     
- Misses        2042     2060      +18     
- Partials       665      684      +19     

Files	Coverage Δ
...adog/android/sessionreplay/SessionReplayPrivacy.kt	100.00% <100.00%> (ø)
...dog/android/sessionreplay/SessionReplayRecorder.kt	94.74% <100.00%> (ø)
...y/internal/recorder/base64/ImageWireframeHelper.kt	95.20% <100.00%> (+0.28%)	⬆️

... and 23 files with indirect coverage changes