[clang] Cleanup docs and code for legacy no_sanitize attributes (NFC). (#161311)

Update generated docs for legacy attributes:

* no_sanitize_(address|thread|memory)
* no_address_safety_analysis

Those are older forms of no_sanitize("list", "of", "sanitizers")
attribute. They were previously as various spellings of the same
attribute, which made the auto-generated documentation confusing.

Fix this by explicitly making them three different attributes. This
would also allow to simplify the delegation to the new no_sanitize form
slightly, as we can instead rely on auto-generated code to check that
TSan and MSan can't be disabled for globals.

**HTML docs before:**
<img width="1004" height="1175" alt="rendered-docs-before"
src="https://github.com/user-attachments/assets/407b5fc1-799c-4882-8ff8-44a5ef3cf4f1"
/>

**HTML docs after:**
<img width="1098" height="1118" alt="rendered-docs-after"
src="https://github.com/user-attachments/assets/236ca93f-25f8-4d58-95ac-ede95ce18d01"
/>

---------

Co-authored-by: Erich Keane <ekeane@nvidia.com>

0 files changed, 0 insertions, 0 deletions