build: minify extensions framework

[abose]

Minifying these extensions

["CloseOthers", "CodeFolding", "DebugCommands", "Git",
    "HealthData", "JavaScriptCodeHints", "JavaScriptRefactoring", "QuickView"]

extensions that nned not be minified either coz they are single file extensions or some other reason.

["CSSAtRuleCodeHints", "CSSCodeHints",
    "CSSPseudoSelectorHints", "DarkTheme", "HandlebarsSupport", "HTMLCodeHints", "HtmlEntityCodeHints",
    "InlineColorEditor", "InlineTimingFunctionEditor", "JavaScriptQuickEdit", "JSLint",
    "LightTheme", "MDNDocs", "Phoenix-prettier", "PrefsCodeHints", "SVGCodeHints", "UrlCodeHints"
]

also added code to break build if any new extension is added in defaultExtensions.json list. they should be part of one of these list to pass build.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud