docs: harmonize examples 'use: ./' syntax explanation

[MikeMcC399]

Situation

Example workflows, such as .github/workflows/example-basic.yml include the syntax uses: ./ to run the action from the root of the repo's current branch. This is not explained in the README and the comments in the different example workflows in the .github/workflows are inconsistently worded. Some workflows don't contain any related remark.

Change

• Add an explanation to the README about uses: ./
• Add a comment to the workflows:

uses: ./ # if copying, replace with cypress-io/github-action@v6

For workflows with multiple calls to the action, add a comment at the top of the workflow to avoid replicating the comment on multiple lines:

# In the example jobs, the action is called with
# uses: ./
# which runs the action code from the current branch.
# If you copy this workflow to another repo, replace the above line with
# uses: cypress-io/github-action@v6

[cypress-app-bot]

• Create a Draft Pull Request if your PR is not ready for review. Mark the PR as Ready for Review when you're ready for a Cypress team member to review the PR.

[MikeMcC399]

@jennifer-shehane

I made your suggested style change through a global edit as the debug workflow was the original text I copied from and that wasn't visible in the PR.

[github-actions]

🎉 This PR is included in version 6.10.3 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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