fix: Validate SQLite project names during init

[angelo-lacson]

What this PR does / why we need it:

feast init currently accepts a hyphenated project name for the default local template, then generates a repository that cannot load because its SQLite online store rejects that name.

This change validates the project name against the selected built-in template before creating the target directory. SQLite-backed templates now return the existing SQLite-specific error immediately, while the general project-name validator continues to allow hyphens.

The PR implements option 2 proposed in the issue and is a draft pending maintainer confirmation of that behavior.

Which issue(s) this PR fixes:

Fixes #6808

Checks

• I've made sure the tests are passing.
• My commits are signed off (git commit -s)
• My PR title follows conventional commits format

Testing Strategy

• Unit tests
• Integration tests
• Manual tests
• Testing is not required for this change

pytest sdk/python/tests/unit/local_feast_tests/test_init.py -q
4 passed

Also verified the changed files with Ruff formatting and lint checks.

Misc

The regression test confirms that feast init hyphen-name fails with the SQLite-specific message and does not leave a partially generated directory.

[angelo-lacson]

Hi, maintainers, this PR is ready for review and the workflows are awaiting approval, Thanks!