Move TLS roots into the trust policy

See accepted proposal for details:

• https://git.glasklar.is/system-transparency/project/documentation/-/blob/main/proposals/2023-12-05-clean-up-ca-selection.md?ref_type=heads
• https://git.glasklar.is/system-transparency/project/documentation/-/blob/main/archive/2023-12-11-meeting-minutes.md?ref_type=heads#decisions

Closes #154 (closed). Related to stprov!47 (merged) and stimages!1 (closed) which should be merged after this MR. Also update the filename in system-transparency/core/system-transparency after merge.