feat(profile): deprecate profile commands and --profile flag

[LorrisSaintGenez]

What

• The --profile flag is deprecated: still visible in help with a (DEPRECATED: ...) note, and prints a warning when used (pointing to --application-id or algolia application select)
• The --application-id and --api-key global flag descriptions now document their defaults (current application / its stored key)
• The profile commands (add, list, remove, setdefault) are marked [Deprecated] in help (kept visible) and print a stderr warning pointing to their replacement (auth login, application list, application select); profile remove has no new-model equivalent yet
• The auth failure hint now says Please run 'algolia auth login' to get started. instead of pointing to profile add
• All remaining user-facing help texts, prompts, and error messages were reworded from "CLI profile" to the current-application model (auth login/signup, application select/create/list/update/upgrade/downgrade, crawler auth help)

Test

make build, then:

1. ./algolia --help — --profile listed with (DEPRECATED: ...); new --application-id/--api-key descriptions; profile group listed with [Deprecated]
2. ./algolia indices list -p <alias> — deprecation warning on stderr, command still works
3. ./algolia profile --help — all 4 subcommands visible with [Deprecated]; running any of them prints the replacement hint on stderr
4. ./algolia application select|create|list|update|upgrade|downgrade --help and ./algolia auth login|signup|crawler --help — no more "CLI profile" wording

GROUT-305

[codacy-production]

Up to standards ✅

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_{TIP This summary will be updated as you push new changes.}