Bump deployment target to 15.0

[koke]

Closes: #7850

Description

Updates the minimum deployment version to 15.0 on all the project's targets. Doing this shows 40+ new deprecation warnings. I've addressed a couple of them but others will need some extra work:

• 'animation' was deprecated in iOS 15.0: Use withAnimation or animation(_:value:) instead.
• 'kUTTypeImage'/'kUTTypeGIF' was deprecated in iOS 15.0
• 'contentEdgeInsets'/'imageEdgeInsets'/'titleEdgeInsets' was deprecated in iOS 15.0: This property is ignored when using UIButtonConfiguration. There's a whole new way of styling buttons on iOS 15, which would require more than a quick fix
• 'windows' was deprecated in iOS 15.0: Use UIWindowScene.windows on a relevant window scene instead. This is mostly used on a reimplementation of currentKeyWindow, which was deprecated in iOS 13. We'll need to eventually invest some time in adapting the existing hacks to window scenes, or removing them altogether.

Also noted ☝🏽 in p91TBi-9WX-p2

Testing instructions

CI tests should pass.

For the animation change:

1. Go to Settings > Help & Support > View Application Log
2. The button on the bottom-right corner should scroll to the bottom of the log with an animation

For the UTTType changes:

1. Save a GIF to your camera roll
2. Go to products
3. Add a new product
4. Add an image, select "Choose from device"
5. Select the "Recents" album
6. The GIF should have a "GIF" badge.

---

• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[wpmobilebot]

You can test the changes from this Pull Request by:

• Clicking here or scanning the QR code below to access App Center
• Then installing the build number pr7851-9b4387f on your iPhone

If you need access to App Center, please ask a maintainer to add you.

[koke]

As I was working on some other branch I noticed that I might not have updated every single target to 15.0. Turning this to draft again while I double check

[toupper]

Nice job @koke! It builds and test cases run fine. Unfortunately, I see a bunch of "deprecated in iOS 15" warnings e.g 'contentEdgeInsets' was deprecated in iOS 15.0: This property is ignored when using UIButtonConfiguration

Shall we get rid of those in this PR, or create an issue to address them later?

[koke]

I put up an internal discussion in p91TBi-9WX-p2, although it makes sense to also create the issues here. I don't think we should block this PR on those, since they might require a decent amount of effort and we might want to prioritize that separately.

[toupper]

I put up an internal discussion in p91TBi-9WX-p2, although it makes sense to also create the issues here. I don't think we should block this PR on those, since they might require a decent amount of effort and we might want to prioritize that separately.

Ah great, I approved it then :)

[koke]

Created those issues in #7881 and #7882

[peril-woocommerce]

	Warnings
⚠️	This PR is assigned to a milestone which is closing in less than 2 days Please, make sure to get it merged by then or assign it to a later expiring milestone

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