[Many] Remove network policy from metadata

[mboetger]

It turns out the io.flutter.network-policy is not connected to the engine. Remove any mention of it.

Regardless, this should control dart sockets and these metadata tags are only added because of Espresso.

Addresses: flutter/flutter#183153

Pre-Review Checklist

• I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
• I read the [Tree Hygiene] page, which explains my responsibilities.
• I read and followed the [relevant style guides] and ran [the auto-formatter].
• I signed the [CLA].
• The title of the PR starts with the name of the package surrounded by square brackets, e.g. [shared_preferences]
• I [linked to at least one issue that this PR fixes] in the description above.
• I followed [the version and CHANGELOG instructions], using [semantic versioning] and the [repository CHANGELOG style], or I have commented below to indicate which documented exception this PR falls under[^1].
• I updated/added any relevant documentation (doc comments with ///).
• I added new tests to check the change I am making, or I have commented below to indicate which [test exemption] this PR falls under[^1].
• All existing and new tests are passing.

[gemini-code-assist]

Code Review

This pull request removes the io.flutter.network-policy meta-data tag from the AndroidManifest.xml files in the example applications for the file_selector_android, image_picker_android, video_player_android, webview_flutter, and webview_flutter_android packages. This removal is applied to both debug and main manifest variants.

_{Note: Security Review has been skipped due to the limited scope of the PR.}

[mboetger]

Override changelog and version: configuration change of example apps.

[stuartmorgan-g]

LGTM

[auto-submit]

auto label is removed for flutter/packages/11165, Failed to merge flutter/packages/11165 with FormatException: Unexpected end of input (at character 1)

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