Ensure craco build has enough heap space.

[absoludity]

Description of the change

Ensures that the craco build step has enough heap space. I can reproduce the issue that CI sees by reducing the heap space and re-running:

% yarn build
yarn run v1.22.19
warning ../../package.json: No license field
$ npm-run-all build-css compile-lang build-js
warning ../../package.json: No license field
$ sass src/ --no-source-map && yarn run copy-clr
warning ../../package.json: No license field
$ shx cp ./node_modules/@clr/ui/clr-ui-dark.min.css public/clr-ui-dark.min.css && shx cp node_modules/@clr/ui/clr-ui.min.css public/clr-ui.min.css && shx cp ./node_modules/@clr/ui/clr-ui-dark.min.css.map public/clr-ui-dark.min.css.map && shx cp ./node_modules/@clr/ui/clr-ui.min.css.map public/clr-ui.min.css.map
warning ../../package.json: No license field
$ formatjs compile-folder lang src/locales/ --ast --format simple
warning ../../package.json: No license field
$ export NODE_OPTIONS=--max-old-space-size=256 && craco build
Creating an optimized production build...

<--- Last few GCs --->

[47979:0x158008000]     7400 ms: Scavenge (reduce) 251.8 (262.0) -> 251.2 (262.0) MB, 1.3 / 0.0 ms  (average mu = 0.230, current mu = 0.085) allocation failure 
[47979:0x158008000]     7406 ms: Scavenge (reduce) 252.2 (262.0) -> 251.3 (262.0) MB, 0.5 / 0.0 ms  (average mu = 0.230, current mu = 0.085) allocation failure 
[47979:0x158008000]     7408 ms: Scavenge (reduce) 252.2 (262.0) -> 251.4 (262.0) MB, 0.4 / 0.0 ms  (average mu = 0.230, current mu = 0.085) allocation failure 

Benefits

Less friction getting things landed.

Possible drawbacks

Could be a patch solution for a memory leak.

Applicable issues

• ref Investigate and fix spurious test failures causing failing badges on the main README #6052

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