Improvement: Verify mandatory/optional process requirements implementation in docs-as-code

### What

Queries for mandatory/optional process requirements implementation shall be found [here ](https://github.com/eclipse-score/process_description/issues/590#issuecomment-3989365043)

kindly check the status of process requirements Implemented: Partial in docs-as-code and share your feedback

gd_req__arch_attr_fulfils ->
https://github.com/eclipse-score/docs-as-code/blob/main/src/extensions/score_metamodel/metamodel.yaml#L648 - Implemented as optional instead of mandatory
https://github.com/eclipse-score/docs-as-code/blob/main/src/extensions/score_metamodel/metamodel.yaml#L561 - implemented as optional instead of mandatory

gd_req__arch_attr_mandatory ->
https://github.com/eclipse-score/docs-as-code/blob/main/src/extensions/score_metamodel/metamodel.yaml#L648 - implemented as optional instead of mandatory
https://github.com/eclipse-score/docs-as-code/blob/main/src/extensions/score_metamodel/metamodel.yaml#L561 - implemented as optional instead of mandatory

gd_req__arch_linkage_requirement_type ->
enfoced in optional instead of mandatory https://github.com/Chidananda-Swamy/docs-as-code/blob/main/src/extensions/score_metamodel/metamodel.yaml#L626

gd_req__req_attr_test_covered ->
https://github.com/eclipse-score/docs-as-code/blob/main/src/extensions/score_metamodel/metamodel.yaml#L122 -testcovered attribute is missing in gd_req
https://eclipse-score.github.io/docs-as-code/main/internals/requirements/requirements.html#tool_req__docs_arch_link_fulfils

gd_req__req_linkage_fulfill ->
https://github.com/eclipse-score/docs-as-code/blob/main/src/extensions/score_metamodel/metamodel.yaml#L648 - implemented as optional instead of mandatory
https://github.com/eclipse-score/docs-as-code/blob/main/src/extensions/score_metamodel/metamodel.yaml#L561 - implemented as optional instead of mandatory

gd_req__req_traceability ->
fully implemented in metamodel, but implemented status showing as partial.

gd_req__req_validity -> what is still missing here?
https://github.com/eclipse-score/docs-as-code/blob/main/src/extensions/score_metamodel/checks/check_options.py#L230

Additional info: https://github.com/eclipse-score/process_description/issues/590#issuecomment-4002352727)

### How

Infra team to cross verify the implementation status against process requirements and fix it as applicable in docs-as-code repo

### Estimates for realization

6hr

### Category

- [ ] Affects Detailed Design

### Requirements / Architecture

- [x] Requirements / Architecture are not affected by this change?