[BD-46] feat: add i18n support for ProductTour Checkpoint sr-only message

[khudym]

Description

Add i18n support for ProductTour Checkpoint sr-only message
Issue

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[openedx-webhooks]

Thanks for the pull request, @khudym!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (64611f7) 92.82% compared to head (ae63a66) 92.83%.
Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2758   +/-   ##
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  Coverage   92.82%   92.83%           
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  Files         235      235           
  Lines        4237     4240    +3     
  Branches     1029     1029           
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+ Hits         3933     3936    +3     
  Misses        300      300           
  Partials        4        4           

Files	Coverage Δ
src/ProductTour/Checkpoint.jsx	77.14% <ø> (ø)

... and 1 file with indirect coverage changes

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[viktorrusakov]

This not the right way to translate messages with variables in it, the correct syntax is as follows (see docs):

<FormattedMessage
  id="pgn.ProductTour.Checkpoint.position-text" // should change the id as well, we try to follow <component>.<subComponent> pattern in our ids
  defaultMessage="Top of step {step}"
  value={{ step: index + 1 }}
  description="Screen-reader message to indicate the user's position in a sequence of checkpoints."
/>

[PKulkoRaccoonGang]

Do I need to add keys for this translation to the i18n folder?

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[openedx-semantic-release-bot]

🎉 This PR is included in version 21.7.0 🎉

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[openedx-semantic-release-bot]

🎉 This PR is included in version 22.0.0-alpha.15 🎉

The release is available on:

• npm package (@alpha dist-tag)
• GitHub release

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