chore(maintenance): avoid attaching two middlewares to ua

[am29d]

Description of your changes

This PR adds a check before adding user agent middleware, to avoid attaching two or more middlewares and fire a warning in the catch block. I have also refactored the tests, to make it a bit more readable.

Related issues, RFCs

Issue number: closes #1578

Checklist

• My changes meet the tenets criteria
• I have performed a self-review of my own code
• I have commented my code where necessary, particularly in areas that should be flagged with a TODO, or hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my change is effective and works
• The PR title follows the conventional commit semantics

Breaking change checklist

Is it a breaking change?: NO

• I have documented the migration process
• I have added, implemented necessary warnings (if it can live side by side)

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[dreamorosi]

@mergify rebase

[mergify]

rebase

❌ Base branch update has failed

Git reported the following error:

Rebasing (1/5)
The previous cherry-pick is now empty, possibly due to conflict resolution.
If you wish to commit it anyway, use:

    git commit --allow-empty

Otherwise, please use 'git rebase --skip'
interactive rebase in progress; onto 5eba149
Last command done (1 command done):
   pick e2aaa83 add user agent to appconfig parameters
Next commands to do (4 remaining commands):
   pick 5817243 add user agent to dynamodb provider
   pick b7a3c01 add user agent to secrets provider
  (use "git rebase --edit-todo" to view and edit)
You are currently rebasing branch '1578-avoid-attaching-two-middlewares-to-ua' on '5eba149'.
  (all conflicts fixed: run "git rebase --continue")

nothing to commit, working tree clean
Could not apply e2aaa83... add user agent to appconfig parameters

err-code: 29980

[dreamorosi]

Could you please rebase the branch? I see changes from a previous one in the diff and want to make sure we are not overwriting things.

I tried to do it with @ mergify but it doesn't work if the branch is on a fork.