Refresh podcasts in background in watch app

[ashiagr]

Description

This adds a background refresh toggle in settings and refreshes podcasts in the background if the toggle is set to on. Initially, the toggle is set to off to prevent unnecessary background processing for the watch app.

Task #1008

Testing Instructions

1. Apply this patch to reduce refesh initial and periodic interval. [Note that periodic delay lesser than 15 minutes is not allowed.]
2. Fresh install the app
3. Login with a plus account having podcasts
4. Go to Settings
5. Notice that you see "Background refresh" toggle which is set to off
6. Clear logs and go to recent apps
7. Search BgTask: RefreshPodcastsTask in logs
8. Notice that you do not see BgTask: RefreshPodcastsTask - runNow - Start in logs
9. Reopen the app
10. Go to Settings
11. Toggle on "Background refresh"
12. Clear logs and go to recent apps
13. Notice that you see BgTask: RefreshPodcastsTask - runNow - Start in logs
14. (Optional) Wait for the periodic interval set in the patch in Step 1. [Step 15, 16 are optional, you can see results in the screen shot included below.]
15. (Optional) Notice that you again see BgTask: RefreshPodcastsTask - runNow - Start in logs

Screenshots or Screencast

I added toggle description in 62a2ce9. If the text feels too long, feel free to revert the commit or shorten the text for wear app.

On	Off

Checklist

• If this is a user-facing change, I have added an entry in CHANGELOG.md
• I have considered whether it makes sense to add tests for my changes
• All strings that need to be localized are in modules/services/localization/src/main/res/values/strings.xml
• Any jetpack compose components I added or changed are covered by compose previews

I have tested any UI changes...

• with different themes
• with a landscape orientation
• with the device set to have a large display and font size
• for accessibility with TalkBack

[mchowning]

These changes look good.

It seems like the text is not entirely accurate. For example, it seems to me that with background refresh turned on, the app refreshes every time the app comes from the background, but if it is turned off it will wait at least 5 minutes before refreshing again.

With that said, this is the same setting and text that we use in the phone app, so for now I think it's fine to leave it as-is and we can iterate on it.

Similarly, the length of the text isn't ideal for a watch, but it feels like having some explanatory text is good. Maybe there's a different UI pattern (opening a full screen toggle or using a toast message) that we could use here in the future (cc: @david-gonzalez-a8c ).