Consolidate fixtures and handlers

[allanlasser]

Since fixtures and handlers are only used by stories and tests, this PR should be fine to merge once our checks pass.

After this merges and becomes base for sveltekit, I will open a separate PR against that branch incorporating the fixtures and handlers we've added in that branch.

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Coverage report

St.:grey_question:	Category	Percentage	Covered / Total
🔴	Statements	2.8% (+0% 🔼)	1978/70691
🔴	Branches	3.04% (-0% 🔻)	925/30453
🔴	Functions	3.22% (+0.01% 🔼)	503/15642
🔴	Lines	2.84% (+0% 🔼)	1796/63189

Show new covered files 🐣

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St.^{:grey_question:}

| File | Statements | Branches | Functions | Lines | | :-: | :- | :- | :- | :- | :- | | 🔴 |

`...` / common.ts

| 0% | 100% | 100% | 0% | | 🔴 |

`...` / documents.ts

| 0% | 100% | 100% | 0% | | 🔴 |

`...` / projects.ts

| 0% | 100% | 100% | 0% | | 🔴 |

`...` / addons.ts

| 0% | 100% | 100% | 0% | | 🔴 |

`...` / accounts.ts

| 0% | 100% | 0% | 0% | | 🔴 |

`...` / documents.ts

| 0% | 100% | 0% | 0% | | 🔴 |

`...` / projects.ts

| 0% | 100% | 100% | 0% | | 🔴 |

`...` / utils.ts

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`...` / addons.ts

| 0% | 100% | 0% | 0% | | 🔴 |

`...` / accounts.ts

| 0% | 100% | 100% | 0% |

Test suite run success

84 tests passing in 16 suites.

Report generated by 🧪jest coverage report action from d99c5e2a23228c32c44aa6ff176dd56741a5b518

[eyeseast]

There are a bunch of type imports in here that need the type annotation. I'll go through and add them.

[eyeseast]

I think I got all the type imports now. Please double check.