fix messaging 'test connection' workflow on initial save

[adamsachs]

Helps close #2455

specifically meant to resolve issue reported in this comment

Code Changes

• i noticed that the messagingDetails param was undefined in the case where the messaging config form loads from "scratch", i.e. there is no messaging default already present for the given service type. this is because the getMessagingConfigurationDetails() query against the backend gets an (expected) 404 in these cases
• since the TestMessagingProviderConnectionButton constructor only really requires the service_type from the messagingDetails, and we know the service_type already given the context of the form, i just define a dummy messagingDetails object with the service_type inferred from the context of the form, in the cases where we haven't successfully retrieved the messagingDetails from the API

Steps to Confirm

Without fix:

1. start with a fresh app db (nox -s teardown -- volumes)
2. nox -s dev -- ui
3. go to configure your messaging provider (http://localhost:3000/privacy-requests/configure), click on e.g. Mailgun Email, fill in a domain and API key (can be whatever value you want)
4. notice this error:

With fix:
repeat steps 1-3, notice that the "test connection" field successfully renders and you are able to successfully submit a messaging connection test (assuming your messaging config details are valid).

Pre-Merge Checklist

• All CI Pipelines Succeeded
• Documentation:
  • documentation complete, PR opened in fidesdocs
  • documentation issue created in fidesdocs
• Issue Requirements are Met
• Relevant Follow-Up Issues Created
• Update CHANGELOG.md

Description Of Changes

• i have no idea if this is a "proper" fix - i have no experience with our FE :) so please take it with a grain of salt and open to any other suggestions! i tried just changing the TestMessagingProviderConnectionButton constructor to just take a service_type: string (since that's all it really needs) but i couldn't get that to play nice in the forms on some quick tries - but i also don't know what i'm doing!

[cypress]

Passing run #643 ↗︎

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Details:

Merge 5cbec21 into 98663d3...
Project: fides	Commit: 52fa55e37e ℹ️
Status: Passed	Duration: 00:40 💡
Started: Mar 6, 2023 3:08 PM	Ended: Mar 6, 2023 3:08 PM

_{This comment has been generated by cypress-bot as a result of this project's GitHub integration settings.}

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (98663d3) 86.71% compared to head (5cbec21) 86.71%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2751   +/-   ##
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  Coverage   86.71%   86.71%           
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  Files         291      291           
  Lines       16315    16315           
  Branches     2067     2067           
=======================================
  Hits        14147    14147           
  Misses       1781     1781           
  Partials      387      387           

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