[CK TILE] Fix basic gemm pipelines

[bartekxk]

[CK TILE] Fix basic gemm pipelines. Refactor and add missing local prefetch

Checklist

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• I have added tests relevant to the introduced functionality, and the unit tests are passing locally
• I have added the test to REGRESSION_TESTS list defined at the top of CMakeLists.txt in tests/CMakeLists.txt, IF the test takes more than 30 seconds to run.
• I have added inline documentation which enables the maintainers with understanding the motivation
• I have removed the stale documentation which is no longer relevant after this pull request
• (If this change is user-facing) I have added release notes which provide the end users with a brief summary of the improvement from this pull request
• I have run clang-format on all changed files
• Any dependent changes have been merged

Discussion

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[Copilot]

Pull request overview

This PR refactors the basic GEMM pipeline implementations (V1 and V2) by extracting common code into a base class and adding missing local prefetch operations to improve performance.

Changes:

• Refactored GEMM pipeline implementations to use a base class for shared functionality
• Added missing LocalPrefetch calls before block GEMM operations
• Added pipeline type traits for BASIC_V1 and BASIC_V2 in convolution configs

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
include/ck_tile/ops/gemm/pipeline/gemm_pipeline_agmem_bgmem_creg_v2.hpp	Refactored V2 pipeline to use base class and added local prefetch calls
include/ck_tile/ops/gemm/pipeline/gemm_pipeline_agmem_bgmem_creg_v1.hpp	Refactored V1 pipeline to use base class and added local prefetch calls
example/ck_tile/20_grouped_convolution/conv_configs.hpp	Added pipeline type traits for BASIC_V1 and BASIC_V2

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