KAFKA-19792: Gradle build fails after Swagger patch version update

[brandboat]

Since version 2.2.27, the Swagger Gradle Plugin introduced lazy
configuration using Gradle's Property<T> API (see
swagger-api/swagger-core@583c21b)

With lazy configuration, properties are not evaluated until task
execution. However, access a property must have a value set. Attempting
to query a property without a value throws:

Cannot query the value of property 'xyz' because it has no value
available

And in genConnectOpenAPIDocs, we manually create a ResolveTask
instance which is responsible for setting default values for these
properties.

This patch explicitly sets these required properties to match their
default values from the Swagger Gradle Plugin conventions defined in
SwaggerPlugin.java

• set alwaysResolveAppPath to false: default is false
• set skipResolveAppPath to false: default is false
• set readAllResources to true: default is true
• set encoding to UTF-8: default is UTF-8

This ensures the manually created ResolveTask has all required
property values, preventing the "Cannot query the value of property"
error.

Reviewers: Dejan Stojadinović dejan2609@users.noreply.github.com,
Chia-Ping Tsai chia7712@gmail.com

[brandboat]

Test step to verify this pr make no changes to the genConnectOpenAPIDocs output.

# checkout to trunk
rm -rf ./docs/generated/
./gradlew clean releaseTarGz
cp ./docs/generated/connect_rest.yaml /tmp/connect_rest.yaml.before

# checkout to this pr branch
rm -rf ./docs/generated/
./gradlew clean releaseTarGz
cp ./docs/generated/connect_rest.yaml /tmp/connect_rest.yaml.after

# no output, means nothing changes
diff /tmp/connect_rest.yaml.before /tmp/connect_rest.yaml.after

[brandboat]

gentle ping @chia7712, @dejan2609, would you mind take a look when you are available? Thank you!

[dejan2609]

@brandboat one non-binding LGTM ✅ from my side !