Auto select feed if only one exists

[Eakam1007]

Issue This PR Addresses

Fixes #3687

Type of Change

• Bugfix: Change which fixes an issue
• New Feature: Change which adds functionality
• Documentation Update: Change which improves documentation
• UI: Change which improves UI

Description

During the signup process, after the user enters their blog URL and clicks Validate Blog, it shows a list of possible feed URLs.
If only one feed URL is returned, it should get selected automatically

Steps to test the PR

• Follow the setup instructions to setup login (if testing locally)
• Navigate to telescope homepage, and click on sign up
• Follow the prompts until you reach the Blog URL form
• Enter a Blog URL for which only one Feed URL exists and click 'Validate Blog'
• Check that Feed URL is automatically selected
• Repeat the above with a Blog URL for which there are multiple feed URLs and click 'Validate Blog'
• Check that no feed URL is automatically checked

Checklist

• Quality: This PR builds and passes our npm test and works locally
• Tests: This PR includes thorough tests or an explanation of why it does not
• Screenshots: This PR includes screenshots or GIFs of the changes made or an explanation of why it does not (if applicable)
• Documentation: This PR includes updated/added documentation to user exposed functionality or configuration variables are added/changed or an explanation of why it does not(if applicable)

[gitpod-io]

[humphd]

This is marked "draft." When you're ready for review, let us know.

[humphd]

@Eakam1007 don't merge master into your branch, please rebase and squash.

[Eakam1007]

@Eakam1007 don't merge master into your branch, please rebase and squash.

Oh sorry. I will rebase

[manekenpix]

LGTM 👍

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