docs(component-testing): Added rerender/updating props recipe

[agg23]

User facing changelog

Provided recipe example of how to update props without remounting in component testing.

How has the user experience changed?

Documentation update only; no user experience changes.

[cypress-bot]

Thanks for taking the time to open a PR!

• 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.
• Become familiar with the Code Review Checklist for guidelines on coding standards and what needs to be done before a PR can be merged.

[cypress]

---

Test summary

9394 • 0 • 119 • 3 • 1

---

Run details

Project	cypress
Status	Passed
Commit	d9b05f6
Started	Apr 5, 2021 3:47 AM
Ended	Apr 5, 2021 4:00 AM
Duration	12:35 💡
OS	Linux Debian - 10.5
Browser	Multiple

View run in Cypress Dashboard ➡️

---

Flakiness

	cypress/integration/retries.ui.spec.js		1
1	runner/cypress retries.ui.spec > opens attempt on each attempt failure for the screenshot, and closes after test passes

---

This comment has been generated by cypress-bot as a result of this project's GitHub integration settings. You can manage this integration in this project's settings in the Cypress Dashboard

[elevatebart]

The new recipe is very useful as is.
Could you add a mention of rerender somewhere please?
This is what users are going to be searching for.
Let's give them a leg up ;)

[lmiller1990]

Need approval from @elevatebart to merge.

[elevatebart]

Hope to get the rerender function in there soon... people will ask for it.