Update "Using conditions to control job execution" Github Actions documentation

[mcummings128]

Clarify usage of conditions in job execution and note limitations for shell conditions.

Why:

Closes: TBD

What's being changed (if available, include any code snippets, screenshots, or gifs):

The Github Actions documentation page "Using conditions to control job execution
" (see link below)

https://docs.github.com/en/actions/how-tos/write-workflows/choose-when-workflows-run/control-jobs-with-conditions

Adds a small blurb that shell conditionals are not supported/evaluated in jobs.<job_id>.if. While immediately obvious if trying to execute a workflow that does this, this should be stated explicitly. The phrase "You can use any supported context and expression to create a conditional." is not restrictive enough.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[github-actions]

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Source	Review	Production	What Changed
actions/how-tos/write-workflows/choose-when-workflows-run/control-jobs-with-conditions.md	fpt ghec ghes@ 3.20 3.19 3.18 3.17 3.16 3.15	fpt ghec ghes@ 3.20 3.19 3.18 3.17 3.16 3.15

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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