Workload ID: Add tbot support for JWT SVIDs

[strideynet]

Closes #38930

Depends on #46968

➜  teleport git:(strideynet/jwt-svid-tbot) ✗ e/build/tbot spiffe-inspect --path unix:///Users/noah/code/gravitational/teleport-scratch/tbot-workload-id/workload.sock
2024-10-01T11:35:43+01:00 INFO [TBOT]      Inspecting SPIFFE Workload API Endpoint path:unix:///Users/noah/code/gravitational/teleport-scratch/tbot-workload-id/workload.sock tbot/spiffe.go:34
# X509 SVIDs
- spiffe://leaf.tele.ottr.sh/example
  - Hint: my-hint
  - Expiry: 2024-10-02 10:35:43 +0000 UTC (23h59m59.558023s)
# X509 Trust Bundles
- leaf.tele.ottr.sh (#CAs: 1)
- spire.tele.ottr.sh (#CAs: 7)
# JWT SVIDs
- spiffe://leaf.tele.ottr.sh/example
  - Expiry: 2024-10-01 10:40:43 +0000 UTC (4m59.558007s)
  - Audiences: [example.com]
  - Hint: my-hint
  - Value: eyJhbGciOiJSUzI1NiIsImtpZCI6IlJIX2hvTXNFNGJUclhYUWdBeGdSSXFjUUIxVF9kTTZmYkd3ZjVVcXJjUUUiLCJ0eXAiOiJKV1QifQ.eyJhdWQiOiJleGFtcGxlLmNvbSIsImV4cCI6MTcyNzc3OTI0MywiaWF0IjoxNzI3Nzc4OTQzLCJqdGkiOiI3YTg2MTNhYWY0Njc4YWFiODI0ZjcyODgxNDE1OTk2OCIsInN1YiI6InNwaWZmZTovL2xlYWYudGVsZS5vdHRyLnNoL2V4YW1wbGUifQ.LuP3f6QN57blBTlZtLREsSgO2cT7hF3g6aRRPx14CxXReruJAwYUEVGcrN25-QfSJLsFPXN4VJgyx8B3m7SjDVefYkAcDtYCTF35tfpX78R2Z39HDgq857MKcd1MDRrw5fEq9VvOVjkVr_s0xMXbFfhzAPPein1RGReBkPyYA3enPnXjNAqgmJFhsLgH_BEO1jeyZy8vAcWu2vdF4Yw1qnUauv9EWzGVl4g9a9lwwDUS4CdXHFa6sffkIRWjbzjj9B-66uR79eHVObQdek1k3FhFBLHhqCKsHBKd2Wyj8grA7lwdwUk1WnDQaUK4zB3dU-sJfj_38Ln0HXQZuJiRag
  - Validation: PASS
# JWT Bundles
- leaf.tele.ottr.sh (#Keys: 1)
  - Key ID: RH_hoMsE4bTrXXQgAxgRIqcQB1T_dM6fbGwf5UqrcQE
- spire.tele.ottr.sh (#Keys: 6)
  - Key ID: KxeujEhOuaMRuUn9QqEaOIAzIYG0e2da
  - Key ID: 8LDn79GUYgUUHqu0aSupSDJJDB5lshPq
  - Key ID: q03gi0rwInhk0GacneikaAADbY0Ykwht
  - Key ID: qAPMQUvis2ggmQmoSTouAr6nmtTsfz3O
  - Key ID: H6VCy7DB0jO3lCDBDZQxY0UxSLi2DX6z
  - Key ID: Vvl8nRMrpLEiHXba8am44RzWSMo5V5zP

changelog: Teleport Workload ID now supports issuing JWT SVIDs via the Workload API.