The error message is unclear when deleting a secret referenced by an environment variable

[v-ruizh]

OS: All
Build Version: 20250730.1

Repro Steps:

1. Add an environment variable and reference a secret for it.
2. Delete the secret.
3. Check whether the error message is clear or not.

Expect:
The error message is clear, indicating that the secret is referenced by an environment variable.

Actual:
The error message is unclear.