Apply suggestions from code review

Co-authored-by: Techassi <git@techassi.dev>

Author: siegfriedweber

crates/stackable-operator/src/v2/builder/pod/container.rs

@@ -190,7 +190,11 @@ impl<'a> From<&'a EnvVarSet> for Vec<&'a EnvVar> {
         value.into_iter().collect()
     }
 }
-
+impl From<EnvVarSet> for Vec<EnvVar> {
+    fn from(value: EnvVarSet) -> Self {
+        value.into_iter().collect()
+    }
+}
 impl<'a> IntoIterator for &'a EnvVarSet {
     type IntoIter = vec::IntoIter<Self::Item>;
     type Item = &'a EnvVar;
@@ -211,11 +215,7 @@ impl IntoIterator for EnvVarSet {
     type Item = EnvVar;
 
     fn into_iter(self) -> Self::IntoIter {
-        Vec::from(&self)
-            .into_iter()
-            .cloned()
-            .collect::<Vec<_>>()
-            .into_iter()
+        Vec::from(self).into_iter()
     }
 }