fix: speed up "fast" linters

[ldez]

Currently, there are 2 problems:

1. typecheck uses LoadModeTypesInfo and WithLoadForGoAnalysis.
   So the load mode of the linter config for the metalinter is always LoadModeTypesInfo and never LoadModeSyntax.
2. the metalinter has a hardcoded call to WithLoadForGoAnalysis, then the types are always loaded.

As a consequence, the "fast" linters (like lll, gofmt, misspell, etc.) are slower than expected when either they are running alone or only "fast" linters are run.

This PR changes the config linter load mode of typecheck to LoadModeNone and removes WithLoadForGoAnalysis for this fake linter.
The metalinter goanalysis load mode is computed based on linters.

typecheck doesn't need an explicit load mode because it is never run alone, then at the end, the load mode will depend on the load mode of the real linters.
Same thing for the goanalysis load mode.

FYI, there are 2 load modes:

• the config linter load mode (LoadModeTypesInfo, LoadModeSyntax, etc.)
• the goanalysis load mode (WithLoadForGoAnalysis, WithLoadFiles)

They are used for different purposes.

---

Based on local tests (verbose mode), the performances are improved (~50%).

On golangci-lint code

Current version:

• golangci-lint cache clean; golangci-lint run --enable-only misspell --enable-only lll -v
• Execution took between 1.4s and 950ms

With the PR:

• golangci-lint cache clean; ./golangci-lint run --enable-only misspell --enable-only lll -v
• Execution took between 900ms and 800ms

On Traefik code

Current version:

• golangci-lint cache clean; golangci-lint run --enable-only gofmt --enable-only misspell -v
• Execution took between 1.3s and 1.2ms

Current version:

• golangci-lint cache clean; ./golangci-lint run --enable-only gofmt --enable-only misspell -v
• Execution took between 650ms and 500ms

Fixes #2914
Fixes #4639

[bombsimon]

LGTM