RTEMS | testsuites/sptests: Add spclock_err03 for post-2100 validation (!1102)

[SHIVAM DEOLANKAR (@D3athSkulll)]

SHIVAM DEOLANKAR created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1102

Project:Branches: D3athSkulll/rtems:spclock-post2100-tests to rtems/rtos/rtems:main
Author:   SHIVAM DEOLANKAR



## Summary

testsuites/sptests: Add spclock_err03 for post-2100 validation\
\
Add spclock_err03 to provide coverage for dates beyond 2100\
without increasing runtime. The test verifies century and\
leap-year rules via RTEMS clock APIs and gmtime()/mktime()\
for representative future years.\
\
Fixes #5507  

## AI Details

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### Prompt used

Refine the leap year validation logic for coverage beyond 2100 without increasing runtime by creation of new spclock_err03 test and then help me add the new test to testsuites respictive yml.

### AI model used

ChatGPT (OpenAI GPT-5.2)

### How AI was used for the contribution

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- [x] Test creation.
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- [ ] The entire contribution was generated using AI
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### Access

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