use github-mgmt stewards for non-admin management of github-mgmt

[aschmahmann]

Summary

This cleans up some duplicated permissions that don't seem necessary and puts github-mgmt stewards modifications back under github-mgmt control (with the exception of ipdx and org admins).

Why do you need this?

• Deduplication: Just seems like a reasonable idea
• Removing maintainer on github-mgmt stewards: It says to do so in the YAML
  • Seems to have been reverted by an auto-update which might've happened while @dhuseby had admin permissions

What else do we need to know?

cc @dhuseby @p-shahi in case there was a reason things ended up like this

DRI: myself

Reviewer's Checklist

• It is clear where the request is coming from (if unsure, ask)
• All the automated checks passed
• The YAML changes reflect the summary of the request
• The Terraform plan posted as a comment reflects the summary of the request

[github-actions]

The following access changes will be introduced as a result of applying the plan:

Access Changes

There will be no access changes

[aschmahmann]

Grabbed text from this commit d2487f1, which is effectively being reverted here

[github-actions]

Before merge, verify that all the following plans are correct. They will be applied as-is after the merge.

Terraform plans

libp2p

Terraform used the selected providers to generate the following execution
plan. Resource actions are indicated with the following symbols:
  ~ update in-place
  - destroy

Terraform will perform the following actions:

  # github_repository_collaborator.this["github-mgmt:dhuseby"] will be destroyed
  # (because key ["github-mgmt:dhuseby"] is not in for_each map)
  - resource "github_repository_collaborator" "this" {
      - id         = "github-mgmt:dhuseby" -> null
      - permission = "push" -> null
      - repository = "github-mgmt" -> null
      - username   = "dhuseby" -> null
    }

  # github_repository_collaborator.this["github-mgmt:p-shahi"] will be destroyed
  # (because key ["github-mgmt:p-shahi"] is not in for_each map)
  - resource "github_repository_collaborator" "this" {
      - id         = "github-mgmt:p-shahi" -> null
      - permission = "push" -> null
      - repository = "github-mgmt" -> null
      - username   = "p-shahi" -> null
    }

  # github_team_membership.this["github-mgmt stewards:dhuseby"] will be updated in-place
  ~ resource "github_team_membership" "this" {
        id       = "6630941:dhuseby"
      ~ role     = "maintainer" -> "member"
        # (3 unchanged attributes hidden)
    }

Plan: 0 to add, 1 to change, 2 to destroy.