- Introduced `--plugin-directory` flag for specifying the default plugin directory.
- Updated all relevant CLI documentation to reflect the new flag.
- Adjusted `Taskfile.yml` to handle local plugin installations utilizing the default location.
- Removed hardcoded plugin directory computation logic from internal configs.

This enhancement provides users with better control over plugin management by allowing customization of the default plugin directory.

Signed-off-by: Jakob Möller <jakob.moeller@sap.com>

…flag

Signed-off-by: Jakob Möller <jakob.moeller@sap.com>

# Conflicts:
#	cli/cmd/cmd.go
#	cli/docs/reference/ocm.md
#	cli/docs/reference/ocm_add.md
#	cli/docs/reference/ocm_add_component-version.md
#	cli/docs/reference/ocm_completion.md
#	cli/docs/reference/ocm_completion_bash.md
#	cli/docs/reference/ocm_completion_fish.md
#	cli/docs/reference/ocm_completion_powershell.md
#	cli/docs/reference/ocm_completion_zsh.md
#	cli/docs/reference/ocm_download.md
#	cli/docs/reference/ocm_download_plugin.md
#	cli/docs/reference/ocm_download_resource.md
#	cli/docs/reference/ocm_generate.md
#	cli/docs/reference/ocm_generate_docs.md
#	cli/docs/reference/ocm_get.md
#	cli/docs/reference/ocm_get_component-version.md
#	cli/docs/reference/ocm_version.md