fix: Handle Lex v1 language formatting [CHI-3329]

[gpaoloni]

This PR replicates the changes of techmatters/serverless#758 for the AWS Lambda version of the channel capture handlers.

Description

This PR fixes a bug where channel captures fail for Lex v1 after the changes for Lex v2. The reason is that we have inconsistent formatting for Lex v1 bots (some uppercased). The solution to this bug is to store the bot language with the casing provided without any changes, other than the lower case version sanitized one.

Checklist

• Corresponding issue has been opened
• New tests added
• Feature flags added
• Strings are localized
• Tested for chat contacts
• Tested for call contacts

Other Related Issues

None

Verification steps

AFTER YOU MERGE

1. Cut a release tag using the Github workflow. Wait for it to complete and notify in the #aselo-deploys Slack channel.
2. Comment on the ticket with the release tag version AND any additional instructions required to configure an environment to test the changes.
3. Only then move the ticket into the QA column in JIRA

You are responsible for ensuring the above steps are completed. If you move a ticket into QA without advising what version to test, the QA team will assume the latest tag has the changes. If it does not, the following confusion is on you! :-P