Do not use workspace dependency for AMQP, EH (#2595)

Fixes #2551 in a different way since #2574 effectively turns off default features.

I successfully ran the following as a test:

```bash
eng/scripts/verify-dependencies.rs
cargo test -p azure_security_keyvault_secrets
cargo +nightly -Zpackage-workspace package --allow-dirty -p typespec -p typespec_client_core -p typespec_macros -p azure_core -p azure_core_amqp -p azure_messaging_eventhubs -p azure_security_keyvault_secrets
```

This proves that `azure_core`'s default features were enabled - specifically the `reqwest_deflate` and `reqwest_gzip` feautres to enable their corresponding headers - and that we could package (and publish) versions this way.

Author: heaths

Cargo.toml

@@ -47,7 +47,6 @@ path = "sdk/typespec/typespec_macros"
 [workspace.dependencies.azure_core]
 version = "0.25.0"
 path = "sdk/core/azure_core"
-default-features = false
 
 [workspace.dependencies.azure_core_amqp]
 version = "0.4.0"

sdk/core/azure_core_amqp/Cargo.toml

@@ -19,7 +19,7 @@ edition.workspace = true
 
 [dependencies]
 async-trait.workspace = true
-azure_core = { workspace = true, default-features = false }
+azure_core = { path = "../azure_core", version = "0.25.0", default-features = false }
 fe2o3-amqp = { workspace = true, optional = true }
 fe2o3-amqp-cbs = { workspace = true, optional = true }
 fe2o3-amqp-ext = { workspace = true, optional = true }

sdk/eventhubs/azure_messaging_eventhubs/Cargo.toml

@@ -21,7 +21,7 @@ edition.workspace = true
 async-lock.workspace = true
 async-stream.workspace = true
 async-trait.workspace = true
-azure_core = { workspace = true, default-features = false }
+azure_core = { path = "../../core/azure_core", version = "0.25.0", default-features = false }
 azure_core_amqp.workspace = true
 futures.workspace = true
 rand.workspace = true