BUG: Make sure email addresses to email are provided as a list

[meoflynn]

Description:

If an email address has something like an apostrophe, it will split the email address into individual characters. Email params has been updated to take email addresses as a list of addresses

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Submitter:

Have you (where applicable):

• Added unit tests?
• Checked the latest commit runs on Dev?
• Updated the example config file(s) and README?

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Reviewer

Does this PR:

• Place non-StackStorm code into the lib directory?
• Have unit tests for the action/sensor and lib layers?
• Have clear and obvious action parameter names and descriptions?

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (724476b) 97.16% compared to head (f0a51de) 97.16%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #149   +/-   ##
=======================================
  Coverage   97.16%   97.16%           
=======================================
  Files         134      134           
  Lines        5925     5925           
  Branches      404      404           
=======================================
  Hits         5757     5757           
  Misses        138      138           
  Partials       30       30           

Files	Coverage Δ
lib/custom_types/email_api/aliases.py	100.00% <100.00%> (ø)

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[DavidFair]

This is my fault, I forgot that it's an alias that's imported, we should revert this file (git checkout main <path/to/file>)

Then change it here: https://github.com/stfc/st2-cloud-pack/blob/main/lib/custom_types/email_api/aliases.py#L4