Improve how we persist the last manually disconnected device

[Supereg]

Improve how we persist the last manually disconnected device

♻️ Current situation & Problem

The feature that prevents the last known device from getting reconnected currently doesn't work properly. This PR fixes that to ensure that the last manually disconnected device won't be automatically connected again.

With fully enabling Swift 6, we discovered that SwiftUI assumes that mutations are executed on the MainActor. Therefore, this PR needed to restructures how mutations are notified using Observation and all mutations are now shadowed on the MainActor for improved compatibility with SwiftUI.

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[PSchmiedmayer]

Very cool; thank you!

I will take a look at the runner issues that we have in place as noted on Slack.

[codecov]

Codecov Report

Attention: Patch coverage is 92.78351% with 14 lines in your changes missing coverage. Please review.

Project coverage is 80.63%. Comparing base (8ee8ba9) to head (ffe6d0b).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...uetooth/Model/ManagedAtomicMainActorBuffered.swift	85.37%	6 Missing ⚠️
...etooth/CoreBluetooth/Model/PeripheralStorage.swift	85.00%	3 Missing ⚠️
...rtySupport/CharacteristicPeripheralInjection.swift	0.00%	3 Missing ⚠️
...etooth/CoreBluetooth/Model/MainActorBuffered.swift	96.93%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
- Coverage   80.92%   80.63%   -0.29%     
==========================================
  Files         108      111       +3     
  Lines        5958     6053      +95     
==========================================
+ Hits         4821     4880      +59     
- Misses       1137     1173      +36     

Files with missing lines	Coverage Δ
Sources/SpeziBluetooth/Bluetooth.swift	87.02% <100.00%> (-1.52%)	⬇️
...peziBluetooth/CoreBluetooth/BluetoothManager.swift	82.05% <100.00%> (-0.29%)	⬇️
.../CoreBluetooth/Model/BluetoothManagerStorage.swift	95.33% <100.00%> (+0.14%)	⬆️
...uetooth/CoreBluetooth/Model/DiscoverySession.swift	88.84% <100.00%> (+0.05%)	⬆️
...tooth/CoreBluetooth/Model/GATTCharacteristic.swift	70.74% <100.00%> (-3.51%)	⬇️
...eziBluetooth/Model/Properties/Characteristic.swift	90.33% <100.00%> (-0.58%)	⬇️
...rces/SpeziBluetooth/Model/Properties/Service.swift	80.96% <100.00%> (ø)
...Model/PropertySupport/CharacteristicAccessor.swift	59.36% <ø> (+0.54%)	⬆️
...el/PropertySupport/DeviceStateTestInjections.swift	92.46% <100.00%> (-0.40%)	⬇️
...Modifier/ConnectedDevicesEnvironmentModifier.swift	100.00% <100.00%> (ø)
... and 5 more

... and 11 files with indirect coverage changes

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[PSchmiedmayer]

@Supereg Finally found the time at the runner issues and fixed them; all builds are passing now 🚀