remove pipeline building for OPC UA mockdevice on linux/armv7

[tomqin93]

What this PR does / why we need it:
This PR removes linux/armv7 support for mockdevice opcua since it does not support required libraries for opcua
Will this PR make the community happier?
Maybe
Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:

Release note:

- updates pipeline to remove linux/armv7 building for mockdevice-opcua
- update READMEs to use unified badge 

[codecov]

Codecov Report

Base: 22.60% // Head: 22.60% // No change to project coverage 👍

Coverage data is based on head (f86ed03) compared to base (2f7db41).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #250   +/-   ##
=======================================
  Coverage   22.60%   22.60%           
=======================================
  Files           8        8           
  Lines         836      836           
=======================================
  Hits          189      189           
  Misses        628      628           
  Partials       19       19           

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