doc(frontend): volume support for tensorboard viewer and other visualize results (#4345)
doc(frontend): volume support for tensorboard viewer and other visualize results (#4345)

* support local file storage type for local volume mount path, refer: https://github.com/kubeflow/pipelines/issues/4208

* add todo comment to support directory and filePath include wildcards '*', detail refer: https://github.com/kubeflow/pipelines/issues/4208

* revert old code indent

* run 'npm run format' to format code

* support tensorboard viewer and other visualize Results using volume mount path, modify 'file' schema to 'volume':

1. source schema: volume://volume-name/relative/path/from/volume/xxx.csv
2. for tensorboard(also support Series1:volume://volume-name/path_to_model_dir_1,Series2:volume://volume-name/path_to_model_dir_2):
* check volume-name was specified in podTemplateSpec( which was inject by VIEWER_TENSORBOARD_POD_TEMPLATE_SPEC_PATH env)
* check /relative/path/from/volume/xxx file path was prefix-mounted in podTemplateSpec
3. for others:
* check volume-name was specified at ml-pipeline-ui pod
* check /relative/path/from/volume/xxx.csv file path exist

* fix test and add more tests

* change error message not found to not exist.

* fix tensorboard create test

* combining volume mount path and key as artifacts path

* extra complex code to a function and add more test

* use ml-pipeline-ui container name to find server container instead of use containers[0]

* fix review suggestion: https://github.com/kubeflow/pipelines/pull/4236

* format code

* extract how to find file path on a pod volume to a common function, and optimize error message

* fix k8s-helper.test error

* add more documentation and fix mistake: volumeMountPath to filePathInVolume

* fix test error

* Update k8s-helper.test.ts

* format error message

* document volume support for tensorboard viewer and other visualize results

* add beta status

* change beta status to alpha status

Co-authored-by: Yuan (Bob) Gong <b533fc967ba90291e42f61196e92e987b26066f3@gmail.com>
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