Removing certificate pinning code and references

[eli-iser]

Removing certificate pinning code as we no longer want the SDK to enforce the certificate pinning. The README will be updated on how this should be achieved by the SDK users if desired.
This also removes the references to the cert pinning function from the example projects that had it.

Checklist

General Contributing

• Have you read the Code of Conduct and signed the CLA?

Is This a Code Change?

• Non-code related change (markdown/git settings etc)
• SDK Code Change
• Example/Test Code Change

Validation

• Does this code build successfully?
• Do all tests pass?
• Does Stylecop pass?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.59%. Comparing base (0ff5668) to head (12f0be6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #361      +/-   ##
==========================================
+ Coverage   47.89%   53.59%   +5.70%     
==========================================
  Files          17       16       -1     
  Lines        1570     1403     -167     
  Branches      137      136       -1     
==========================================
  Hits          752      752              
+ Misses        776      609     -167     
  Partials       42       42              

Flag	Coverage Δ
integration	50.10% <ø> (+5.32%)	⬆️
unit	10.54% <ø> (+1.12%)	⬆️

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[maxbelanger]

lgtm, pending adding the right link. cc @april can you take a look at the messaging?