[Docs] document all params supported by pyflyte

[samhita-alla]

Description

• environment variables can be sent to the pyflyte command: more context in [Flytekit/Pyflyte] Pyflyte register & launchplan commands don't support --envs flag  #4092 PR description
• launch plans can be activated and deactivated using pyflyte: more context in Pyflyte register optionally activates schedule flytekit#1832 PR
• launch plans can also be selectively activated: more context in Feature: add activate-launchplan command to pyflyte flytekit#1588 PR
• add docs for pyflyte info, pyflyte fetch and more!: more context in Flyte flyte:// file system and improve remote file handling flytekit#1674 and Auto download for fetch flytekit#1918 PR descriptions

Are you sure this issue hasn't been raised already?

• Yes

Have you read the Code of Conduct?

• Yes

[davidmirror-ops]

@samhita-alla do you think this issue is still relevant? I see all of those options covered here: https://docs.flyte.org/en/latest/api/flytekit/pyflyte.html#pyflyte-cli