bump difftest & mkdir for wave/perf for local-ci script's run-mode (#1927)

* bump difftest, assign empty value to OBJCACHE

* local-ci: mkdir for wave/perf at run-mode

debug: add local-ci.py to run github/emy.yml's ci tests at local server (#1925)

Usage:
1. run ci test
`python3 scripts/local_ci.py --xs-path $(pwd) --run`

2. print ci test name
`python3 script

debug: add local-ci.py to run github/emy.yml's ci tests at local server (#1925)

Usage:
1. run ci test
`python3 scripts/local_ci.py --xs-path $(pwd) --run`

2. print ci test name
`python3 scripts/local_ci.py --xs-path $(pwd) --show-test`

3. print ci test command into splited sh files. Run the sh manualy.
`python3 scripts/local_ci.py --xs-path $(pwd)`
More Params:
--sh-path: default is xs-path/ci-sh.

Other Params:
--pick-test MC: only run 'EMU - MC'
--numa: use numa ctrl, require eypc
--head-sha: magic word, default is today's date
--nemu-home/--am-home: don't know if it is used

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