feat: allow mobile webapp [SQSERVICES-1831]

[tlebon]

SQSERVICES-1831 Bug when loading from app.wire.com through mobile device browser in Desktop mode - In Android (iOS - not an issue)

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PR Submission Checklist for internal contributors

• The PR Title

  • conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
  • contains a reference JIRA issue number like SQPIT-764
  • answers the question: If merged, this PR will: ... ³

• The PR Description

  • is free of optional paragraphs and you have filled the relevant parts to the best of your ability

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What's new in this PR?

Issues

there were several issues blocking mobile webapp/ causing inconsistencies. safari was never supported so in some cases android and ios would behave differently (one would show a login screen and then fail/ one would lock you out). it should be aligned and mobile browsing should be allowed(?)

Causes (Optional)

runtime variables are catching 'unallowed' browsers from the userAgent

Solutions

allow safari/mobile browsers

Dependencies (Optional)

If there are some other pull requests related to this one (e.g. new releases of frameworks), specify them here.

Needs releases with:

• GitHub link to other pull request

Notes (Optional)

I have also removed references to PWA as this concept has been scrapped and it was touching this PR it made sense to clean it out.

[codecov]

Codecov Report

Merging #14595 (d0dab65) into dev (9d037fa) will increase coverage by 0.27%.
The diff coverage is 7.14%.

@@            Coverage Diff             @@
##              dev   #14595      +/-   ##
==========================================
+ Coverage   42.32%   42.59%   +0.27%     
==========================================
  Files         612      613       +1     
  Lines       20917    20925       +8     
  Branches     4793     4795       +2     
==========================================
+ Hits         8853     8914      +61     
+ Misses      10949    10898      -51     
+ Partials     1115     1113       -2     

[CLAassistant]

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