fix: brev ls all showing all instances in org

[riac03]

Problem:

brev ls --all was not correctly displaying all organization workspaces in the table output.
Although the command is intended to show every workspace in the organization, the table rendering flow was still filtering workspaces using FilterForUserWorkspaces, which limited the displayed instances to only those associated with the current user. As a result, organization workspaces were missing from the CLI table output even when --all was specified.
This inconsistency occurred because the JSON and table output paths used different workspace selection logic:

• The JSON output correctly used the full workspacesToShow list.
• The table rendering path recalculated and reused userWorkspaces, reintroducing user-level filtering into the --all flow.

Solution

Updated the table rendering flow to use the same workspace selection logic as the JSON output path.

• Removed the additional userWorkspaces filtering from the table display flow.
• Ensured the table output directly uses the already computed workspacesToShow list when --all is enabled.

This ensures that brev ls --all consistently displays all organization workspaces across all output modes.