Delete azure_identity dead code (Azure#2603)

Author: chlowell

Cargo.lock

@@ -85,7 +85,6 @@ getrandom = { version = "0.2", features = ["js"] }
 hmac = { version = "0.12" }
 litemap = "0.7.4"
 log = "0.4"
-oauth2 = { version = "5.0.0", default-features = false }
 openssl = { version = "0.10.72" }
 pin-project = "1.0"
 proc-macro2 = "1.0.86"

Cargo.toml

@@ -35,7 +35,6 @@ getrandom
 hmac
 litemap
 log
-oauth2
 openssl
 pin-project
 proc-macro2

eng/dict/crates.txt

@@ -17,7 +17,6 @@ async-lock.workspace = true
 async-trait.workspace = true
 azure_core.workspace = true
 futures.workspace = true
-oauth2.workspace = true
 openssl = { workspace = true, optional = true }
 pin-project.workspace = true
 serde.workspace = true