Bug Fix - IAM Authn Fails

[semyon-estrin]

Desired Outcome

As part of Ruby 3 support, rexml gem was isolated in :test :development gem environments.
This gem is required in production for IAM authentication (at least).
The Root cause for the separation is that Ruby 3 gem is external, comparing to 2.5 where it comes with the Ruby itself.
Documentation for this separation.

This bug reconstructs only during manual tests, automatic tests do not exist for IAM authenticator.

Implemented Changes

Move rexml in Gemfile to production environment.

Definition of Done

Authentication succeeds in prod environment - reconstructs in manual tests only.

Changelog

• The CHANGELOG has been updated, or
• This PR does not include user-facing changes and doesn't require a
  CHANGELOG update

Test coverage

• This PR includes new unit and integration tests to go with the code
  changes, or
• The changes in this PR do not require tests

Documentation

• Docs (e.g. READMEs) were updated in this PR
• A follow-up issue to update official docs has been filed here: insert issue ID
• This PR does not require updating any documentation

Behavior

• This PR changes product behavior and has been reviewed by a PO, or
• These changes are part of a larger initiative that will be reviewed later, or
• No behavior was changed with this PR

Security

• Security architect has reviewed the changes in this PR,
• These changes are part of a larger initiative with a separate security review, or
• There are no security aspects to these changes

[codeclimate]

Code Climate has analyzed commit fa3419f and detected 1 issue on this pull request.

Here's the issue category breakdown:

Category	Count
Style	1

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 88.0%.

View more on Code Climate.

[codeclimate]

Lists should be surrounded by blank lines