Clean up all `TODO: fix in v11` comments

[linear]

Make sure we take the opportunity of a SemVer major bump to clean up some unnecessary uses of any in our publicly facing types.

$ git grep "TODO: fix in v11"
packages/core/src/types-hoist/error.ts:  // TODO: fix in v11, convert any to unknown
packages/core/src/types-hoist/misc.ts:  // TODO: fix in v11, convert any to unknown
packages/core/src/types-hoist/samplingcontext.ts:  // TODO: fix in v11, convert any to unknown
packages/core/src/types-hoist/stackframe.ts:  // TODO: fix in v11, convert any to unknown
packages/core/src/types-hoist/stackframe.ts:  // TODO: fix in v11, convert any to unknown
packages/core/src/types-hoist/user.ts:  // TODO: fix in v11, convert any to unknown
packages/core/src/utils/is.ts:// TODO: fix in v11, convert any to unknown

[linear]

JS-1334