chore: remove non-existing static functions from known globals

[dnalborczyk]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:

Description

they do not exist in Chrome (node.js), Firefox, Safari, and never heard of these either:

getNotifier: I'm guessing something which didn't find it's way into the language api: http://man.hubwiz.com/docset/JavaScript.docset/Contents/Resources/Documents/developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getNotifier.html

getOwn: did not find any docs

[codecov]

Codecov Report

Merging #4313 (5201696) into master (84d2382) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4313   +/-   ##
=======================================
  Coverage   98.44%   98.44%           
=======================================
  Files         205      205           
  Lines        7316     7316           
  Branches     2084     2084           
=======================================
  Hits         7202     7202           
  Misses         55       55           
  Partials       59       59           

Impacted Files	Coverage Δ
src/ast/nodes/shared/knownGlobals.ts	92.00% <ø> (ø)

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