Rework auto completion tests

[janpio]

This is what it looks like right now: https://github.com/prisma/language-tools/blob/main/packages/language-server/src/test/completion.test.ts

language-tools/packages/language-server/src/test/completion.test.ts

Lines 543 to 556 in 86de4b8

	assertCompletion(
	modelBlocksUri,
	{ line: 13, character: 16 },
	{
	isIncomplete: false,
	items: [
	fieldAttributeUnique,
	fieldAttributeMap,
	fieldAttributeDefault,
	fieldAttributeRelation,
	fieldAttributeIgnore,
	],
	},
	)

These tests should really be "On schema ... long string | ... with cursor at position as marked in string by |, autocomplete should suggest the following things for auto completion" - and everything else should be automated by the test system we have.

[Jolg42]

Note that the same test (but slightly different implementation) is done in both vscode and language-server packages and the schema used is duplicated in both.
So it could make sense to tackle this at the same time or after having some test abstraction that will remove the duplication.

[Jolg42]

Internal Notion