feat(data_source_newrelic_notifications_destination): Support name in destination data source

[lzaga-newrelic]

Description

Add support for creating destination data sources by name. Jira ticket link here.

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist:

Please delete options that are not relevant.

• My commit message follows conventional commits
• My code is formatted to Go standards
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes. Go here for instructions on running tests locally.

How to test this change?

Please describe how to test your changes. Include any relevant steps in the UI, HCL file(s), commands, etc

• Create a destination with a specific name via New Relic notifications destination UI - in the Alerts tab
• Add this code to your terraform file with the name of the destination:

data "newrelic_notification_destination" "foo" {
  name = <destination_name>
}

[lzaga-newrelic]

Waiting for this PR: newrelic/newrelic-client-go#1014

[codecov-commenter]

Codecov Report

Merging #2395 (c5d32a9) into main (8ec7a5b) will decrease coverage by 0.01%.
The diff coverage is 40.00%.

@@            Coverage Diff             @@
##             main    #2395      +/-   ##
==========================================
- Coverage   33.96%   33.95%   -0.01%     
==========================================
  Files          91       91              
  Lines       24760    24773      +13     
==========================================
+ Hits         8409     8411       +2     
- Misses      16199    16210      +11     
  Partials      152      152              

Impacted Files	Coverage Δ
.../data_source_newrelic_notifications_destination.go	53.57% <40.00%> (-7.00%)	⬇️

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