chore(deps): upgrade to node 22

[JasonSooter]

Before this PR

• Node 18 used for local development and CI/CD
• lint-staged v13.3.0 with micromatch security vulnerability (moderate severity)

After this PR

• Node 22 now used for Segment Functions
• lint-staged updated to v16.2.7 resolving all security vulnerabilities (0 vulnerabilities)
• Upgraded all devDependencies given they aren't used by the code in production
• ESLint pinned to v8.x to maintain .eslintrc.js config compatibility
• Pre-commit hook now runs lint-staged before tests

Reason that prompted this change

• [JPM-2311] Node v22 Upgrade - Functions compatibility - Jira

Test Plan

• All unit tests continue to pass
• ESLint runs successfully
• Code remains identical; only Node runtime version changes

[Copilot]

Pull request overview

This PR upgrades the Node.js runtime from version 18 to version 22 and updates all development dependencies to resolve security vulnerabilities. The upgrade addresses a moderate severity vulnerability in micromatch (via lint-staged v13.3.0).

Changes:

• Node.js runtime upgraded from v18 to v22 in .nvmrc, package.json, and all workflows
• All devDependencies upgraded to latest compatible versions, with lint-staged moving from v13.0.3 to v16.2.7
• GitHub Actions updated from actions/checkout@v4 to v6 and actions/setup-node@v4 to v6
• Husky configuration migrated from legacy format to v9.x with enhanced pre-commit script that enforces Node 22 requirement

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

File	Description
package.json	Updated Node engine to 22, upgraded all devDependencies, migrated husky config from inline hooks to script-based approach
.nvmrc	Changed Node version from 18 to 22
.husky/pre-commit	Replaced simple husky.sh loader with comprehensive script that loads NVM, validates Node 22, and runs lint-staged before tests
.github/workflows/deployFunction.yml	Updated GitHub Actions to v6 for both checkout and setup-node across all environments

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