When the same SECTION is encountered multiple times in one cycle, catch crashes on assert

**Describe the bug**

Suppose we have nested SECTIONs in a helper function and call that function from one TEST_CASE, from the same section. Then the same sections are entered multiple times (because they have the same name and location). The same could be achieved by a loop.

In that scenario, Catch asserts/segfaults (see the attached compiler explorer link).

**Expected behavior**

Either it should work "as expected", or it should error out with a reasonable error message. Also, the documentation of `SECTION` should include clear warning that this is not supported (also a link to `DYNAMIC_SECTION` would be handy).

**Reproduction steps**

https://godbolt.org/z/rMP8vf6xe

**Platform information:**

- Catch version: devel