`circleci orb validate` gives the same misleading error message when `parameters` is mispelled as (seemingly) any 10 character word

## Meta:

**CircleCI CLI Version:**

```
$ circleci version
0.1.19293+897ebaf (release)
```

**Operating System:**

```
$ cat /etc/os-release
NAME="Ubuntu"
VERSION="18.04.6 LTS (Bionic Beaver)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 18.04.6 LTS"
VERSION_ID="18.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=bionic
UBUNTU_CODENAME=bionic
```

**CircleCI CLI Diagnostic:**

```
$ circleci diagnostic

---
CircleCI CLI Diagnostics
---
Debugger mode: false
Config found: /home/brandon/.circleci/cli.yml
API host: https://circleci.com
API endpoint: graphql-unstable
Error: please set a token with 'circleci setup'
You can create a new personal API token here:
https://circleci.com/account/api
```

---

## Current behavior:

I've mispelled `<< parameters.modules >>`, for example `<< paramaters.modules >>`, somewhere in my orb's definition.
```
Error: Error calling command: 'filter'
Unknown variable(s): modules
Error calling job: 'continue'
Error calling command: 'filter'
Unknown variable(s): modules
```
Now, I've purposely misspelled it a 10 character string `<< aaaaaaaaaa.modules >>`:
```
Error: Error calling command: 'filter'
Unknown variable(s): modules
Error calling job: 'continue'
Error calling command: 'filter'
Unknown variable(s): modules
```
It produces the same output.

## Expected behavior:

Ideally, it tells me `aaaaaaaaa` isn't a valid attribute or reference? It took me all of 30 minutes to track down that it wasn't an error related to a missing parameter altogether, but rather that I'd misspelled `parameters` as `paramaters` somewhere in my orb.

## When did this begin / Was this previously working?:

Seems to be happening on the latest release? I've just noticed this, so I'm not sure how long.

## Additional Information:

N/A - you can try this on any orb, I'm sure.

Reproduce the report with `circleci orb validate`, comparing `<< parameters.modules >>`, the misspelled `<< paramaters.modules >>`, and a 10-character identifier. Trace the validation path that emits “Unknown variable(s): modules”; done when invalid references produce an accurate diagnostic that distinguishes the misspelled root from a missing parameter.

Written by the indexing model from the issue text.