fix(sdk): nested operationIds and tags. Add tests for nested class generation

[flow96]

Fixes #2377

This bug only occures when asClass was set to true and when the schema contains the same nested tags and operationIds. For example:

...
operationId: providers.domains.get
tags:
- Providers
- Domains
...

Based on that schema the implementation tries to build a paths like this: providers.providers.domains.get and domains.providers.domains.get (the tags are used for the root class and then the path is built up from the operationId).

The problem that occurs, is that the generator tries add the same class multiple times and then link these two or more instances with each other, which ends up in an endless recursion loop.

I fixed it by removing the root class from the path if the same class name appears later in that path already. So for our example the new path would be:
providers.domains.get

I added two tests to verify the class generation works with nested classes - with and without instance creation.

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Latest commit: c78c2ca

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Codecov Report

❌ Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 22.77%. Comparing base (7c64fc8) to head (c78c2ca).

Files with missing lines	Patch %	Lines
...s/openapi-ts/src/plugins/@hey-api/sdk/operation.ts	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2426      +/-   ##
==========================================
- Coverage   22.77%   22.77%   -0.01%     
==========================================
  Files         334      334              
  Lines       32941    32944       +3     
  Branches     1302     1302              
==========================================
  Hits         7502     7502              
- Misses      25430    25433       +3     
  Partials        9        9              

Flag	Coverage Δ
unittests	22.77% <0.00%> (-0.01%)	⬇️

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