Add simpler unwrapping of createAsyncThunk promises

[markerikson]

This PR:

• Adds a .unwrap() function attached to promises returned from createAsyncThunk
• Merges back the changes from Remove unnecessary condition #846 into master, since they went into next

Fixes #775, fixes #910 .

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[markerikson]

Hmm.

@hardfist , for some reason I'm seeing this failure in the CI action , at https://github.com/reduxjs/redux-toolkit/pull/970/checks?check_run_id=2242739748 :

> @reduxjs/toolkit@1.5.1 build-ci /home/runner/work/redux-toolkit/redux-toolkit
> node scripts/build.js && tsc && tsc -p src/query/tsconfig.json && api-extractor run

dir: /home/runner/work/redux-toolkit/redux-toolkit/dist
/home/runner/work/redux-toolkit/redux-toolkit/node_modules/esbuild/bin/esbuild:2
throw new Error(`esbuild: Failed to install correctly
^

Error: esbuild: Failed to install correctly

Make sure you don't have "ignore-scripts" set to true. You can check this with
"npm config get ignore-scripts". If that returns true you can reset it back to
false using "npm config set ignore-scripts false" and then reinstall esbuild.

If you're using npm v7, make sure your package-lock.json file contains either
"lockfileVersion": 1 or the code "hasInstallScript": true. If it doesn't have
either of those, then it is likely the case that a known bug in npm v7 has
corrupted your package-lock.json file. Regenerating your package-lock.json file
should fix this issue.

Strictly speaking, the build-ci step is, uh... "passing". but only because that somehow isn't returning an error code.

Any idea why we might be having an issue there?

[github-actions]

Size Change: +211 B (0%)

Total Size: 84.9 kB

Filename	Size	Change
dist/redux-toolkit.cjs.development.js	11.7 kB	+6 B (0%)
dist/redux-toolkit.cjs.production.min.js	5.65 kB	+4 B (0%)
dist/redux-toolkit.esm.js	11.3 kB	+3 B (0%)
dist/redux-toolkit.modern.development.js	9.2 kB	+4 B (0%)
dist/redux-toolkit.modern.js	9.24 kB	+9 B (0%)
dist/redux-toolkit.modern.production.min.js	4.31 kB	+3 B (0%)
dist/redux-toolkit.umd.js	21.7 kB	+109 B (0%)
dist/redux-toolkit.umd.min.js	11.6 kB	+73 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
dist/index.js	146 B	0 B

_{compressed-size-action}

[hardfist]

oh esbuild currently doesnt support npm7 because of npm bug

[hardfist]

npm/cli#2606

[hardfist]

you may need to use npm@6 before bug fixed

[markerikson]

Apparently the issue was just that we had --ignore-scripts in our workflow file, so the binary wasn't getting downloaded.

[hardfist]

Apparently the issue was just that we had --ignore-scripts in our workflow file, so the binary wasn't getting downloaded.

i never expect this :)