[cli] Explicitly use vc project vs. vc projects (#8113)

This is a follow-up to #8091 which:

- Makes `vc project` the default command, with `vc projects` aliased to `vc project` (previously it was not clear in the code which one was the "real" command)
- Makes some helper names for `ls` more specific

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#### Tests

- [ ] The code changed/added as part of this PR has been covered with tests
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packages/cli/test/helpers/parse-table.ts

@@ -1,4 +1,4 @@
-export function getDataFromIntro(output: string): {
+export function pluckIdentifiersFromDeploymentList(output: string): {
   project: string | undefined;
   org: string | undefined;
 } {
@@ -11,7 +11,7 @@ export function getDataFromIntro(output: string): {
   };
 }
 
-export function parseTable(output: string): string[] {
+export function parseSpacedTableRow(output: string): string[] {
   return output
     .trim()
     .replace(/ {1} +/g, ',')