refactor the media types golden table

[devoncarew]

• some minor refactoring of the media types golden table to make it a little easier to understand what changes a diff implies

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[github-actions]

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[gemini-code-assist]

Code Review

This pull request refactors the generation of the media types markdown table to improve diff readability. The changes in pkgs/mime/tool/media_types.dart use fixed-width padding for table columns. While this is a good idea for cleaner diffs, the implementation has a couple of issues. The hardcoded padding values are insufficient for longer MIME types, causing broken table alignment. Additionally, removing the code formatting (backticks) for MIME types and extensions reduces the readability of the rendered documentation. My review includes a suggestion to dynamically calculate column widths and restore the code formatting to address these issues.

[github-actions]

PR Health

Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
mime	None	2.0.0	2.0.0	2.0.0	✔️

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pkgs/bazel_worker/benchmark/benchmark.dart
pkgs/bazel_worker/example/client.dart
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pkgs/benchmark_harness/integration_test/perf_benchmark_test.dart
pkgs/boolean_selector/example/example.dart
pkgs/clock/lib/clock.dart
pkgs/clock/lib/src/clock.dart
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pkgs/clock/lib/src/stopwatch.dart
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pkgs/clock/test/clock_test.dart
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pkgs/coverage/lib/src/coverage_options.dart
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pkgs/html/lib/src/constants.dart
pkgs/html/lib/src/encoding_parser.dart
pkgs/html/lib/src/html_input_stream.dart
pkgs/html/lib/src/list_proxy.dart
pkgs/html/lib/src/query_selector.dart
pkgs/html/lib/src/token.dart
pkgs/html/lib/src/tokenizer.dart
pkgs/html/lib/src/treebuilder.dart
pkgs/html/lib/src/utils.dart
pkgs/html/test/dom_test.dart
pkgs/html/test/parser_feature_test.dart
pkgs/html/test/parser_test.dart
pkgs/html/test/query_selector_test.dart
pkgs/html/test/selectors/level1_baseline_test.dart
pkgs/html/test/selectors/level1_lib.dart
pkgs/html/test/selectors/selectors.dart
pkgs/html/test/support.dart
pkgs/html/test/tokenizer_test.dart
pkgs/html/test/trie_test.dart
pkgs/html/tool/generate_trie.dart
pkgs/pubspec_parse/test/git_uri_test.dart
pkgs/stack_trace/example/example.dart
pkgs/watcher/test/custom_watcher_factory_test.dart
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