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Fix messages for file lookup issues - error scenario (#3654); see #3646

Scenario where multiple files (all) are not found only show a single message.
I feel its useful for debugging to keep the message if only 1 file is not found. Happy to remove if others don't agree.

No changes where at least 1 is found (still prints msg).

See PR https://github.com/mochajs/mocha/pull/3650 for full details

## Scenarios

### Nothing given
Command: `mocha`
Output:
```
Error: No test files found: "test/"
```

### Nothing found
Command: `mocha -R json-stream --no-config "test/integration/fixtures/glob/**/*-none.js"`
Output:
```
Error: No test files found: "test/integration/fixtures/glob/**/*-none.js"
```

### Multiple not found
Command: `mocha -R json-stream --no-config "test/integration/fixtures/glob/**/*-none.js" "test/integration/fixtures/glob/**/*-none-again.js"`
New output
```
Error: No test files found
```
Previous output
```
Error: Cannot find any files matching pattern "test/integration/fixtures/glob/**/*-none.js"
Error: Cannot find any files matching pattern "test/integration/fixtures/glob/**/*-none-again.js"
```

## Applicable issues
(semver-patch)

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