Create Rust Foundation staff team and make it a part of the Project

[Kobzol]

Alternative to #2234.

[jackh726]

I mean, this is fine by me too (and the longer staff list is good regardless).

[github-actions]

Dry-run check results

[WARN  sync_team] sync-team is running in dry mode, no changes will be applied.
[INFO  sync_team] synchronizing crates-io
[INFO  sync_team] synchronizing github
[INFO  sync_team] 💻 Team Diffs:
    📝 Editing team 'rust-lang/all':
      Adding member 'abibroom' with member role
      Adding member 'baumanj' with member role
      Adding member 'becrumbul' with member role
      Adding member 'ernestkissiedu' with member role
      Adding member 'walterhpearce' with member role
    💻 Repo Diffs:
    📝 Editing repo 'rust-lang/bors':
      Rulesets:
          Ruleset for main
            No changes

[tshepang]

Suggested change

	"ernestkissiedu"
	"ernestkissiedu",

[tshepang]

Suggested change

	"abibroom"
	"abibroom",