Various general project updates

[stefanceriu]

• Add .xcprivacy info files to the main app, the notification service extension and the broadcast upload one
• switch the default Xcode version used to 15.2
• switch the github actions to the macos-14 runner

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 81.81818% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 12.41%. Comparing base (2ec3ae1) to head (608f760).

Files	Patch %	Lines
...rOtherSessions/View/UserOtherSessionsToolbar.swift	81.81%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #7766 +/- ## =========================================== + Coverage 12.39% 12.41% +0.02% =========================================== Files 1650 1650 Lines 163861 163903 +42 Branches 66390 67322 +932 =========================================== + Hits 20305 20356 +51 - Misses 142888 142892 +4 + Partials 668 655 -13 ``` | [Flag](https://app.codecov.io/gh/element-hq/element-ios/pull/7766/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=element-hq) | Coverage Δ | | |---|---|---| | [uitests](https://app.codecov.io/gh/element-hq/element-ios/pull/7766/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=element-hq) | `55.66% <81.81%> (+0.61%)` | :arrow_up: | | [unittests](https://app.codecov.io/gh/element-hq/element-ios/pull/7766/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=element-hq) | `6.20% <0.00%> (-0.03%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=element-hq#carryforward-flags-in-the-pull-request-comment) to find out more.

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[github-actions[bot]]

:iphone: Scan the QR code below to install the build for this PR. :lock: This build is for internal testing purpose. Only devices listed in the ad-hoc provisioning profile can install Element Alpha.

If you can't scan the QR code you can install the build via this link: https://i.diawi.com/os2BRB

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud