chore: remove Flutter web deprecations

[ndonkoHenri]

Description

Running flutter build web shows the following deprecation warning:

Warning: In index.html:40: Local variable for "serviceWorkerVersion" is deprecated. Use
"{{flutter_service_worker_version}}" template token instead. See
https://docs.flutter.dev/platform-integration/web/initialization for more details.
Warning: In index.html:107: "FlutterLoader.loadEntrypoint" is deprecated. Use "FlutterLoader.load"
instead. See https://docs.flutter.dev/platform-integration/web/initialization for more details.

Right now one still appears:

Warning: In index.html:40: Local variable for "serviceWorkerVersion" is deprecated. Use
"{{flutter_service_worker_version}}" template token instead. See
https://docs.flutter.dev/platform-integration/web/initialization for more details.

flet/client/web/index.html

Lines 39 to 40 in 3260031

	// The value below is injected by flutter build, do not touch.
	var serviceWorkerVersion = null;

removing the above line clears the last deprecation warning.
@FeodorFitsner, any suggestion?

Summary by Sourcery

Remove deprecated Flutter web code by replacing 'FlutterLoader.loadEntrypoint' with 'FlutterLoader.load' and updating the service worker version handling to use the '{{flutter_service_worker_version}}' template token.

Enhancements:

• Update the Flutter web initialization code to use the new 'FlutterLoader.load' method instead of the deprecated 'FlutterLoader.loadEntrypoint'.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request addresses deprecation warnings in the Flutter web build process by updating the index.html file. The changes focus on replacing deprecated syntax with the recommended approach for initializing the Flutter loader and specifying the service worker version.

File-Level Changes

Change	Details	Files
Update Flutter web initialization code to remove deprecations	Replace '_flutter.loader.loadEntrypoint' with '_flutter.loader.load' Change 'serviceWorker' object to 'serviceWorkerSettings' Replace 'serviceWorkerVersion: serviceWorkerVersion' with 'serviceWorkerVersion: {{flutter_service_worker_version}}'	client/web/index.html

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[sourcery-ai]

Hey @ndonkoHenri - I've reviewed your changes - here's some feedback:

Overall Comments:

• Good job addressing the deprecation warnings. Consider investigating the remaining warning about 'serviceWorkerVersion' to see if it can be resolved in this PR as well, ensuring all deprecation issues are addressed at once.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[FeodorFitsner]

This PR requires more attention/work than expected :)

1. We need to make sure the new initialization mechanism works with flutter_native_splash in flet-build-template repo and then update init code there.
2. "HTML" renderer has gone! https://docs.flutter.dev/platform-integration/web/renderers#renderers and was replaced with skwasm which is related to WASM compilation we are working on in the other branch.