test: run tests outside src in the shared Vitest config

[cryptodev-2s]

Explanation

The shared Vitest config only includes src/**/*.test.ts, but Jest's default testMatch picks up test files anywhere in a package. Seven packages still on Jest keep tests outside src/, almost all of them in a tests/ directory, so migrating any of them would silently stop running those files while the suite still reported green.

This came out of the network-controller migration, where tests/ holds 18463 lines across three files, roughly 70 percent of that package's suite. It needed a per package include override to keep running them. Rather than have every such package rediscover that, the shared config now includes tests/**/*.test.ts as well.

Verified both directions. The eight packages already on Vitest are unaffected, since none has a tests/ directory containing test files, and all eight report the same counts as before. And a file placed in tests/ is genuinely picked up: base-controller goes from 1 file and 74 tests to 2 files and 75 tests with a probe in place.

Two packages will still need their own handling when their turn comes, and neither is made worse by this change. wallet-cli keeps its end to end suite in tests/ and its unit config ignores that directory on purpose, so it will need to exclude it. wallet-framework-docs keeps a test under content/ rather than tests/.

References

• Came out of test: run network-controller on Vitest #10873, which needed the same fix locally
• Part of the Jest to Vitest migration, see test: add Vitest alongside Jest #10546 for the shared setup

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
  • Not applicable, test only change. Carries the no-changelog label.
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them
  • None.

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Note

Low Risk
Test-runner configuration only; no runtime or API behavior changes.

Overview
Expands the shared package Vitest include glob so suites match Jest-style layouts: tests under src/ still run, and tests/**/*.test.ts is picked up without per-package overrides.

This avoids silently dropping large tests/ suites when migrating packages from Jest (e.g. network-controller), where most coverage can live outside src/. Packages already on Vitest with only src/ tests are unchanged; packages that intentionally ignore tests/ (e.g. wallet-cli) can still exclude that path locally when they migrate.

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