fix(sidekick/swift): no escaping for GateExpression (#6829)

When `GateExpression` include an `&&` the generated code for
`{{Codec.GateExpression}}` includes an `&&`. With this PR, we
use triple braces to avoid the HTML escaping.

Author: coryan

internal/sidekick/swift/annotate_enum.go

@@ -59,7 +59,7 @@ func (ann *enumAnnotations) IsGated() bool {
 // In the generated code this is used as:
 //
 // ```
-// #if {{GateExpression}}
+// #if {{{GateExpression}}}
 // ... all the normal code ...
 // #endif
 // ```

internal/sidekick/swift/annotate_message.go

@@ -91,7 +91,7 @@ func (ann *messageAnnotations) IsGated() bool {
 // In the generated code this is used as:
 //
 // ```
-// #if {{GateExpression}}
+// #if {{{GateExpression}}}
 // ... all the normal code ...
 // #endif
 // ```

internal/sidekick/swift/templates/common/enum_file.swift.mustache

@@ -21,7 +21,7 @@ limitations under the License.
 {{/Codec.BoilerPlate}}
 
 {{#Codec.IsGated}}
-#if {{Codec.GateExpression}}
+#if {{{Codec.GateExpression}}}
 {{/Codec.IsGated}}
 import Foundation
 

internal/sidekick/swift/templates/common/message_file.swift.mustache

@@ -21,7 +21,7 @@ limitations under the License.
 {{/Codec.Model.BoilerPlate}}
 
 {{#Codec.IsGated}}
-#if {{Codec.GateExpression}}
+#if {{{Codec.GateExpression}}}
 {{/Codec.IsGated}}
 import Foundation
 {{#Codec.MessageImports}}

internal/sidekick/swift/templates/common/placeholder_file.swift.mustache

@@ -21,7 +21,7 @@ limitations under the License.
 {{/Codec.Model.BoilerPlate}}
 
 {{#Codec.IsGated}}
-#if {{Codec.GateExpression}}
+#if {{{Codec.GateExpression}}}
 {{/Codec.IsGated}}
 import Foundation
 {{#Codec.MessageImports}}

internal/sidekick/swift/templates/convert/convert_enum_file.swift.mustache

@@ -21,7 +21,7 @@ limitations under the License.
 {{/Codec.BoilerPlate}}
 
 {{#Codec.IsGated}}
-#if {{Codec.GateExpression}}
+#if {{{Codec.GateExpression}}}
 {{/Codec.IsGated}}
 import Foundation
 import GoogleCloudGax