Remove references to Cocoapods + Podfiles

[sascala]

---

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about: Create a pull request
label: 'triage me'

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Fixes #<issue_number_goes_here> 🦕

[jedimasterjsa]

@sascala Do you plan to just use this PR since it combines the changes from several of your other PRs? Or will you use the individual ones instead?

[sascala]

Happy to just use this one.

[jedimasterjsa]

SGTM. I think all the failures come because these need to be migrated to use Swift Package Manager in addition to removing the Podfile. I also think that the Places ones have been migrated, so we can either ignore those or just remove them. @boilerwadding to confirm.

Finally, I don't think there's a super big rush. Even after Cocoapods "shuts-down" in Dec, existing pods should continue to work for now. So we do want to update just to demonstrate using SPM, but these samples shouldn't just break if we do nothing.

Point being: we can take a little extra time to properly migrate to SPM.