fix(functions-tools): skip #[json_data(nested)] attribute for Vec of nested structs

[peterpeterparker]

Found while testing junobuild/juno#2634

   Compiling junobuild-cdn v0.6.1 (/Users/daviddalbusco/projects/juno/juno/src/libs/cdn)
   Compiling sputnik v0.3.1 (/Users/daviddalbusco/projects/juno/juno/src/sputnik)
   Compiling junobuild-satellite v0.5.1 (/Users/daviddalbusco/projects/juno/juno/src/libs/satellite)
error[E0425]: cannot find type `VecJsonData` in this scope
   --> src/sputnik/src/generated.rs:400:18
    |
400 |     pub headers: Vec<AppHttpRequestArgsHeaders>,
    |                  ^^^ not found in this scope

error[E0425]: cannot find type `VecJsonData` in this scope
   --> src/sputnik/src/generated.rs:417:18
    |
417 |     pub headers: Vec<AppHttpRequestResultHeaders>,
    |                  ^^^ not found in this scope

For more information about this error, try `rustc --explain E0425`.
error: could not compile `sputnik` (lib) due to 2 previous errors

which originated from generated code

#[derive(CandidType, Serialize, Deserialize, Clone, JsonData)]
pub struct AppHttpRequestArgs {
    pub url: String,
    pub method: AppHttpRequestArgsMethod,
    #[json_data(nested)]
    pub headers: Vec<AppHttpRequestArgsHeaders>,
    pub body: Option<Vec<u8>>,
    pub maxResponseBytes: Option<u64>,
    pub transform: Option<String>,
    pub isReplicated: Option<bool>,
}

[github-actions]

size-limit report 📦

Path	Size
@junobuild/admin	6.24 KB (0%)
@junobuild/core	15.34 KB (0%)
@junobuild/core-worker	21.74 KB (0%)
@junobuild/core-standalone	69.64 KB (0%)
@junobuild/utils	335 B (0%)
@junobuild/errors	1014 B (0%)
@junobuild/functions	2.19 KB (0%)
@junobuild/analytics	12.3 KB (0%)
@junobuild/config	7.15 KB (0%)
@junobuild/auth/delegation	2.51 KB (0%)
@junobuild/auth/automation	761 B (0%)
@junobuild/cdn	971 B (0%)
@junobuild/storage	988 B (0%)
@junobuild/ic-client/actor	7.22 KB (0%)
@junobuild/ic-client/webauthn	1.96 KB (0%)
@junobuild/ic-client/utils	174 B (0%)
@junobuild/ic-client/index	62 B (0%)