[roll] Roll fuchsia [build][beads] Support ffx_plugin migration discovery

Update the Bazel migration discovery script to accurately calculate
the complexity of ffx_plugin and ffx_tool targets. Previously, the
script ignored plugin-specific dependency fields and failed to attribute
complex subtargets to their parent plugins, resulting in undercounted
complexity scores.

Related small improvements:

- Add extra dependency tracking fields.
- Infer ffx_plugin and ffx_tool target types as Rust.
- Handle GN shorthand target label normalization (e.g. //a/b/c).
- Resolve ffx template subtargets (e.g. _suite, _args, _host_tool)
  back to their parent targets into the complexity graph.
- Add cycle detection to the complexity graph walk.
- Add an --include-migrated CLI flag and dynamically calculate the
  "Migrated?" (YES/NO) CSV column based on 0-complexity targets.

I used the new script to generate this sheet:
https://docs.google.com/spreadsheets/d/14IL8tSolnd2sFuyre1PNdV00sH5OB1tx0HfvHi40ERY

Test: fx build --host //build/beads/scripts:tests

Original-Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1770373
Original-Original-Revision: cdb9f98d5d039d0e5fadc0fab9382949a278c580
GitOrigin-RevId: 655468ba4fd943e53f5ef8fa7e0a2e1b0fc03e7e
Change-Id: If5afc4f29c320934c6063a051d54a6b601c9c77d
Reviewed-on: https://fuchsia-review.googlesource.com/c/integration/+/1775013
Cr-Commit-Position: refs/heads/main@{#199983}