fix(spans): Accept supabase without identifiers

[jjbayer]

Follow-up for #3153:

• Only accept from(...)
• Accept table names without scrubbed identifiers.

[Dav1dde]

Oops pressed to quickly:

You can update the added code from the last PR:

 scrubbed_description.as_deref().map(|s| {
                s.trim_start_matches("from(")

to use strip_prefix and strip_suffix

[jjbayer]

Oops pressed to quickly:

You can update the added code from the last PR:

 scrubbed_description.as_deref().map(|s| {
                s.trim_start_matches("from(")

to use strip_prefix and strip_suffix

@Dav1dde Done!