Apply better-regex lint fixes

[ConnorQi01]

Summary

Apply two better-regex lint recommendations without changing validation behavior.

Proposed Changes

• Simplify the filepath validation character class in androidContainerUtility.
• Simplify the version validation digit classes in installExpoGoApplication.
• Remove the corresponding better-regex and unnecessary escape warnings.

Test Plan

• npx prettier --check src\extension\android\androidContainerUtility.ts src\extension\commands\installExpoGoApplication.ts
• npm run build
• npm test - fails in the existing rn-extension commandsRegistered assertion because reactNative.publishToExpHost is present in the runtime command list but absent from the expected list.

Closes #2813

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