Update RUM Event Schema

[fuzzybinary]

What does this PR do?

Update the event schema to only post session.is_active on View events.

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 #1383 (82f1dc4) into develop (ca81ad7) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1383      +/-   ##
===========================================
- Coverage    81.93%   81.90%   -0.03%     
===========================================
  Files          363      363              
  Lines        13015    13015              
  Branches      2188     2188              
===========================================
- Hits         10663    10659       -4     
- Misses        1685     1686       +1     
- Partials       667      670       +3     

see 9 files with indirect coverage changes