Fdc3 fixes

[lilla28]

Description:

• Changed error type when the InstanceId not found
• Removed unnecessary casting
• Trigger the fdc3Ready event after joining the channel if the channel is defined
• Added check for app channels
• Removed redundant filtering on AppChannels
• Removed unncessary property

[codecov]

Codecov Report

Attention: Patch coverage is 81.60920% with 16 lines in your changes missing coverage. Please review.

Project coverage is 68.53%. Comparing base (77de2de) to head (4eb8ed7).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...nt/Infrastructure/Internal/UserChannelSetReader.cs	71.05%	6 Missing and 5 partials ⚠️
...Stanley.ComposeUI.DesktopAgent/Fdc3DesktopAgent.cs	75.00%	2 Missing and 2 partials ⚠️
...tanley.ComposeUI.DesktopAgent/Fdc3StartupAction.cs	95.83%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #778      +/-   ##
==========================================
- Coverage   68.96%   68.53%   -0.43%     
==========================================
  Files         292      293       +1     
  Lines        8676     8667       -9     
  Branches      925     1004      +79     
==========================================
- Hits         5983     5940      -43     
- Misses       2476     2510      +34     
  Partials      217      217              

Files with missing lines	Coverage Δ
...oseUI.DesktopAgent/Contracts/RaiseIntentRequest.cs	100.00% <ø> (ø)
...DependencyInjection/ServiceCollectionExtensions.cs	100.00% <100.00%> (ø)
...ey.ComposeUI.DesktopAgent/Fdc3StartupProperties.cs	100.00% <100.00%> (ø)
...dc3/js/composeui-fdc3/src/ComposeUIDesktopAgent.ts	89.71% <100.00%> (-0.92%)	⬇️
...3/src/infrastructure/MessageRouterIntentsClient.ts	93.93% <100.00%> (ø)
.../infrastructure/messages/Fdc3RaiseIntentRequest.ts	100.00% <ø> (ø)
...tanley.ComposeUI.DesktopAgent/Fdc3StartupAction.cs	88.63% <95.83%> (+2.52%)	⬆️
...Stanley.ComposeUI.DesktopAgent/Fdc3DesktopAgent.cs	77.18% <75.00%> (+0.47%)	⬆️
...nt/Infrastructure/Internal/UserChannelSetReader.cs	71.05% <71.05%> (ø)

... and 11 files with indirect coverage changes