[BUG][JAVA][spring] Invalid annotations produced for collections with qualified types when useBeanValidation set

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

When BeanValidation is used, the annotation @Valid is inserted in a way that produces invalid syntax when there are collections of a fully qualified type.

openapi-generator version

This issue is a regression and was first seen on 6.5.0. It is also present on 6.6.0-20230411.095613-12.

OpenAPI declaration file content or url

openapi: 3.0.2
info: { title: Sample, version: "1.0" }
components:
  schemas:
    Observation:
      type: object
      properties:
        key: { type: string }
        value: { type: integer }
      required: [key, value]
    Report:
      type: object
      properties:
        observations:
          type: array
          items: { $ref: '#/components/schemas/Observation' }
      required: [observations]
paths:
  /reports:
    post:
      operationId: addReport
      requestBody:
        required: true
        content:
          application/json:
            schema: { $ref: '#/components/schemas/Report' }
      responses:
        "204": { description: OK }

Generation Details

java -jar openapi-generator-cli.jar generate -i api.yaml -g spring --schema-mappings Observation=example.ObservationDTO

Steps to reproduce

See the generated src/main/java/org/openapitools/model/Report.java file.

Expected declaration:
List<example.@Valid ObservationDTO> observations

Actual declaration:
List<@Valid example.ObservationDTO> observations

Related issues/PRs

Introduced in #14736.

Suggest a fix

Instead of a simple replace operation, use a regular expression in SpringCodegen::replaceBeanValidationCollectionType

Inspect SpringCodegen::replaceBeanValidationCollectionType and the generation path for the generated Report.java file. Reproduce the issue with the supplied OpenAPI declaration and schema mapping. Done when qualified collection element types receive valid @Valid annotation syntax without breaking ordinary collection types.