The behaviors to fatal assertions can be improved

[ILer32]

• Problem
  For the following 2 examples,
  the first one does not terminate after the fatal assertion, while
  the second one terminates without handling exception.
  The behaviors to fatal assertions can be improved.

#include <boost/ut.hpp>
int main() {
    using namespace boost::ut;
    "basic"_test = [] {
        expect(1_i != 1) << fatal; // fatal assertion
        expect(2_i != 2) << "should not run the row";
        };
    expect(3_i != 3) << "should not run the row";
}

#include <boost/ut.hpp>
int main() {
    using namespace boost::ut;
    expect(1_i != 1) << fatal; // fatal assertion
    expect(2_i != 2) << "should not run the row";
}

Expected Behavior

UT starts =====================================================================
Running test "basic"...
FAILED in: ...\example.cpp:5 - test condition: [1 != 1]
=> terminated for the fatal issue
===============================================================================
Suite global
tests:   1 | 1 failed
asserts: 1 | 0 passed | 1 failed
Completed =====================================================================

UT starts =====================================================================
FAILED in: ...\example.cpp:4 - test condition: [1 != 1]
=> terminated for the fatal issue
===============================================================================
Suite global
tests:   0 | 0 failed
asserts: 1 | 0 passed | 1 failed
Completed =====================================================================

Actual Behavior

UT starts =====================================================================
Running test "basic"...
FAILED in: ...\example.cpp:5 - test condition: [1 != 1]
FAILED in: ...\example.cpp:8 - test condition: [3 != 3] should not run the row
===============================================================================
Suite global
tests:   1 | 1 failed
asserts: 2 | 0 passed | 2 failed
Completed =====================================================================

UT starts =====================================================================
FAILED in: ...\example.cpp:4 - test condition: [1 != 1]
===============================================================================
Suite global
tests:   0 | 0 failed
asserts: 1 | 0 passed | 1 failed