Replace invalid user agent strings with invalid characters

[andrewmcodes]

Type of PR

• [ ] feature
• [x] enhancement
• [ ] bug fix
• [ ] other

Description

This change should stop exceptions raising here because it cannot force encoding to UTF-8

[4] pry(main)> line = "test\x80"
=> "test\x80"
[5] pry(main)> line.encode(Encoding::UTF_8, invalid: :replace)
=> "test�"

This should also help pin down the issue and potentially find a long term fix. At minimum this should allow the impressions to still record.

Fixes #1322

Checklist

• [x] My code follows the style guidelines of this project & the tests are passing
• [x] I have performed a self-review of my own code
• [x] I have requested a review from another developer(s)

[codecov[bot]]

Codecov Report

Merging #1323 into master will increase coverage by 0.00%. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1323   +/-   ##
=======================================
  Coverage   34.75%   34.76%           
=======================================
  Files         345      345           
  Lines        7990     7989    -1     
=======================================
  Hits         2777     2777           
+ Misses       5213     5212    -1     

Impacted Files	Coverage Δ
app/controllers/impressions_controller.rb	90.90% <ø> (+3.95%)	:arrow_up:
app/jobs/schedule_organization_report_job.rb	86.20% <0.00%> (ø)