chore: swiftlint should not lint node_modules

[tido64]

Description

swiftlint should not lint node_modules:

% yarn lint:swift
Linting Swift files in current working directory
[...]
/~/node_modules/@react-native-community/template/template/ios/HelloWorld/AppDelegate.swift:8:135: warning: Colon Spacing Violation: Colons should be next to the identifier when specifying a type and next to the key in dictionary literals (colon)
/~/node_modules/@react-native-community/template/template/ios/HelloWorld/AppDelegate.swift:8:1: warning: Line Length Violation: Line should be 120 characters or less; currently it has 159 characters (line_length)
[...]
Done linting! Found 2 violations, 0 serious in 16 files.

Platforms affected

• Android
• iOS
• macOS
• visionOS
• Windows

Test plan

n/a

[Saadnajmi]

Note: maybe the template app can have a swiftlint config file added to it? Out of scope of this repo though