populate_sdk_ext.bbclass: add *:do_shared_workdir to BB_SETSCENE_ENFORCE_IGNORE_TASKS

populate_sdk_ext.bbclass: add *:do_shared_workdir to BB_SETSCENE_ENFORCE_IGNORE_TASKS

* otherwise populate_sdk_ext task will fail as shown e.g. with:
  bitbake core-image-minimal -c populate_sdk_ext
  esdk.oeSDKExtSelfTest.test_image_generation_binary_feeds
  esdk.oeSDKExtSelfTest.test_install_libraries_headers:

ERROR: Task linux-yocto.do_deploy_links attempted to execute unexpectedly
Task tmp/work/qemux86_64-poky-linux/core-image-minimal/1.0/sdk-ext/image/tmp-renamed-sdk/layers/poky/meta/recipes-core/images/core-image-minimal.bb:do_image_qa, unihash 9d177d4c6ca34e68e19b1bc23deec58c3eabe5f9d5808f90402161163a73f22f, taskhash 9d177d4c6ca34e68e19b1bc23deec58c3eabe5f9d5808f90402161163a73f22f
Task tmp/work/qemux86_64-poky-linux/core-image-minimal/1.0/sdk-ext/image/tmp-renamed-sdk/layers/poky/meta/recipes-core/images/core-image-minimal.bb:do_image_complete, unihash 0aff4dcbdb3c5ca68e0ebb39457fbe86beb3482986ddfe0b0b6fc0386807edbf, taskhash 0aff4dcbdb3c5ca68e0ebb39457fbe86beb3482986ddfe0b0b6fc0386807edbf
This is usually due to missing setscene tasks. Those missing in this build were: {'tmp/work/qemux86_64-poky-linux/core-image-minimal/1.0/sdk-ext/image/tmp-renamed-sdk/layers/poky/meta/recipes-core/images/core-image-minimal.bb:do_image_complete',
 'tmp/work/qemux86_64-poky-linux/core-image-minimal/1.0/sdk-ext/image/tmp-renamed-sdk/layers/poky/meta/recipes-core/images/core-image-minimal.bb:do_image_qa'}
ERROR: Task (tmp/work/qemux86_64-poky-linux/core-image-minimal/1.0/sdk-ext/image/tmp-renamed-sdk/layers/poky/meta/recipes-kernel/linux/linux-yocto_6.5.bb:do_deploy_links) failed with exit code 'setscene ignore_tasks'
NOTE: Tasks Summary: Attempted 4975 tasks of which 4971 didn't need to be rerun and 1 failed.

Summary: 1 task failed:
  tmp/work/qemux86_64-poky-linux/core-image-minimal/1.0/sdk-ext/image/tmp-renamed-sdk/layers/poky/meta/recipes-kernel/linux/linux-yocto_6.5.bb:do_deploy_links
Summary: There was 1 WARNING message.
Summary: There was 1 ERROR message, returning a non-zero exit code.
ERROR: Logfile of failure stored in: tmp/work/qemux86_64-poky-linux/core-image-minimal/1.0/temp/log.do_populate_sdk_ext.2280835
NOTE: recipe core-image-minimal-1.0-r0: task do_populate_sdk_ext: Failed
ERROR: Task (/OE/build/poky/meta/recipes-core/images/core-image-minimal.bb:do_populate_sdk_ext) failed with exit code '1'
NOTE: Tasks Summary: Attempted 6211 tasks of which 6147 didn't need to be rerun and 1 failed.

Summary: 1 task failed:
  /OE/build/poky/meta/recipes-core/images/core-image-minimal.bb:do_populate_sdk_ext
Summary: There was 1 ERROR message, returning a non-zero exit code.

[YOCTO #12937]

Signed-off-by: Martin Jansa <martin.jansa@gmail.com>