[material_ui, cupertino_ui] Add linkToSource

[dkwingsmt]

This PR adds the linkToSource option to dartdoc_options.yaml. This enables the "link to source" button in API docs, which is present in Flutter's doc.

The catch is, while the URL format supports a %r% parameter according to dartdoc's Doc, it's not that useful. The revision parameter is often empty, which leads to crashes. In fact, the dartdoc repo themselves update the link manually: dart-lang/dartdoc@869c9ff

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• I linked to at least one issue that this PR fixes in the description above.
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• All existing and new tests are passing.

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[flutter-dashboard]

It looks like this pull request may not have tests. Please make sure to add tests or get an explicit test exemption before merging.

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[gemini-code-assist]

Code Review

This pull request adds dartdoc_options.yaml files to configure source code linking for the cupertino_ui and material_ui packages, and adds comments to their respective pubspec.yaml files regarding version updates. Feedback points out that the uriTemplate in packages/material_ui/dartdoc_options.yaml incorrectly references the cupertino_ui directory instead of material_ui.

[gemini-code-assist]

The uriTemplate for material_ui incorrectly points to the cupertino_ui directory. It should be updated to point to material_ui instead.

    uriTemplate: 'https://github.com/flutter/packages/blob/material_ui-v0.0.2/packages/material_ui/%f%#L%l%'

[Piinks]

@chunhtai does the batch release process bump the version? Will it need to handle this as well?