Add missing null unions for plain text and static select block action…

[GovernmentHack]

… types

Summary

Add the missing type definitions to fix Issue 1914 #1914

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[GovernmentHack]

Hmm, I'm unsure why the build is failing 🤔 Seems to be because of an import order on a file I haven't touched as part of the PR. I did just get #1910 approved and merged based on the same state of main, but I didn't see if that also had the same failing builds.

[filmaj]

@GovernmentHack I believe it was the change that was introduced in #1910 that is causing this failure. main is failing for me locally. Looks like our tests need updating as now there is a new required username property via #1910.

[GovernmentHack]

@GovernmentHack I believe it was the change that was introduced in #1910 that is causing this failure. main is failing for me locally. Looks like our tests need updating as now there is a new required username property via #1910.

Is #1910 the cause? the errors seem to indicate some sort of import error:

> @slack/[email protected] test
> npm run lint && npm run mocha && npm run test:types


> @slack/[email protected] lint
> eslint --fix --ext .ts src


/home/runner/work/bolt-js/bolt-js/src/receivers/AwsLambdaReceiver.spec.ts
Error:   5:1  error  `crypto` import should occur before import of `sinon`  import/order

✖ 1 problem (1 error, 0 warnings)

Error: Process completed with exit code 1.

[filmaj]

@GovernmentHack #1910 was the cause for the unit tests to fail - if you run just the unit tests locally, you should be able to reproduce (at least, I was able to reproduce locally).
I just fixed the lint failures in #1916 and merged to main. If you can rebase this PR, we can slowly move forward with this PR. Appreciate your patience!

[GovernmentHack]

@filmaj Sure thing! rebased and pushed. Thank you again for the help!

[codecov]

Codecov Report

Merging #1915 (4add60c) into main (ba5b893) will not change coverage.
The diff coverage is n/a.

❗ Current head 4add60c differs from pull request most recent head 9c51b63. Consider uploading reports for the commit 9c51b63 to get more accurate results

@@           Coverage Diff           @@
##             main    #1915   +/-   ##
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  Coverage   82.18%   82.18%           
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  Files          18       18           
  Lines        1521     1521           
  Branches      436      436           
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  Hits         1250     1250           
  Misses        175      175           
  Partials       96       96           

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[filmaj]

@GovernmentHack thanks for the PR but first let's figure out what the issue is, I'd like to continue the conversation in #1914 before we make any additional moves or changes in this PR.

[GovernmentHack]

Per our conversation in the issue, I'm good for this PR to be rejected 👍