FC-0001: rename toggle_warnings to toggle_warning

[dyudyunov]

Rename toggle_warnings to toggle_warning for consistency with setting_warning.

Relates to: openedx/code-annotations#80

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[dyudyunov]

@robrap please, review

[codecov]

Codecov Report

Merging #252 (ebed895) into master (665b2a4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #252   +/-   ##
=======================================
  Coverage   97.07%   97.07%           
=======================================
  Files          69       69           
  Lines        4847     4847           
=======================================
  Hits         4705     4705           
  Misses        142      142           

Flag	Coverage Δ
unittests	97.07% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
lti_consumer/plugin/compat.py	37.33% <ø> (ø)

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[robrap]

1. Let's not update version (or changelogs) for any PRs with these changes. I don't think it is necessary.
2. Can you add the following to commit messages:

Rename toggle_warnings to toggle_warning for consistency
with setting_warning.

3. Can you add that same sentence, as well as a link to the code-annotations PR, to all the PR descriptions?

Thank you.

[dyudyunov]

Ok, got it

[dyudyunov]

I'm going to leave changelogs in the Unreleased section if you don't mind

[openedx-webhooks]

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