fix: escape operationIds before outputting them

[simPod]

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The action name is escaped from ActionName to ``ActionNameOperation. The enum is also exported escaped as ActionNameOperationEnum`.

But currently, enums are then referenced via unescaped name as ActionNameEnum.

[simPod]

@TiFu (2017/07) @taxpon (2017/07) @sebastianhaas (2017/07) @kenisteward (2017/07) @Vrolijkx (2017/09) @macjohnny (2018/01) @topce (2018/10) @akehir (2019/07) @petejohansonxo (2019/11) @amakhrov (2020/02) @davidgamero (2022/03) @mkusaka (2022/04)

[macjohnny]

LGTM
thanks for your contribution.
can you add a test for this?

[simPod]

I tried running tests but

./mvnw clean install ends with

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:3.4.0:jar (attach-javadocs) on project openapi-generator-core: MavenReportException: Error while generating Javadoc: Project contains Javadoc Warnings -> [Help 1]

and IDE does not show Run test button either

so I kinda gave up as I don't know how to setup the project properly.

I've read contributing docs but that did not help with the issue really.