fix(typescript-estree): ensure --fix works with singleRun mode

[JamesHenry]

I realise this isn't the most sophisticated fix (and we can improve this further in the future by adding support for the catch-all builder program as we discussed as part of the long-term solution to createDefaultProgram) but for now this at least makes singleRun mode usable with --fix and in my basic testing locally it still yields a speed up over the same invocation without singleRun mode enabled.

Fixes #3626

[typescript-eslint]

Thanks for the PR, @JamesHenry!

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The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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	nx test @typescript-eslint/eslint-plugin
	nx test @typescript-eslint/eslint-plugin-internal
	nx test @typescript-eslint/eslint-plugin-tslint
	nx test @typescript-eslint/experimental-utils
	nx test @typescript-eslint/parser
	nx test @typescript-eslint/scope-manager
	nx test @typescript-eslint/typescript-estree
	nx test @typescript-eslint/visitor-keys

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[codecov]

Codecov Report

Merging #3655 (7393883) into master (84fff35) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3655      +/-   ##
==========================================
+ Coverage   92.64%   92.68%   +0.04%     
==========================================
  Files         326      325       -1     
  Lines       11253    11344      +91     
  Branches     3171     3201      +30     
==========================================
+ Hits        10425    10514      +89     
- Misses        368      369       +1     
- Partials      460      461       +1     

Flag	Coverage Δ
unittest	92.68% <ø> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
packages/typescript-estree/src/node-utils.ts	97.83% <0.00%> (ø)
packages/typescript-estree/src/simple-traverse.ts	75.00% <0.00%> (ø)
...es/eslint-plugin/src/rules/no-loss-of-precision.ts	91.66% <0.00%> (ø)
...tal-utils/src/ast-utils/eslint-utils/predicates.ts	100.00% <0.00%> (ø)
packages/visitor-keys/src/visitor-keys.ts
packages/visitor-keys/src/get-keys.ts
...eslint-plugin/src/rules/prefer-return-this-type.ts	90.47% <0.00%> (ø)
...ackages/eslint-plugin/src/rules/no-implied-eval.ts	93.93% <0.00%> (+0.18%)	⬆️
...pt-estree/src/create-program/createWatchProgram.ts	77.27% <0.00%> (+0.23%)	⬆️
packages/eslint-plugin/src/rules/return-await.ts	97.02% <0.00%> (+1.15%)	⬆️
... and 6 more