[clang-format] BreakAfterOpenBracketIf has no effect when ContinuationIndentWidth >=4

`BreakAfterOpenBracketIf` has no effect when `ContinuationIndentWidth >=4`. That is, the following line:
```
if (first_very_very_very_very_long_condition && second_very_very_very_very_long_condition) {
```
is formatted as follows (or alike depending on other options):
```
if (first_very_very_very_very_long_condition &&
second_very_very_very_very_long_condition) {
```
Although the desired formatting would be as follows:
```
if (
first_very_very_very_very_long_condition &&
second_very_very_very_very_long_condition
) {
```
My understanding is that this is due to the logic described in [this comment](https://github.com/llvm/llvm-project/blob/708d1c1b8c2468a366f6914b88eaa3f3a4c932b0/clang/lib/Format/ContinuationIndenter.cpp#L875). I'm not sure what the target scenario for this logic is, but with `ContinuationIndentWidth >=4`, it effectively defeats the purpose of `BreakAfterOpenBracketIf`. Would removing the respective "conservation" check break anything?

Start in clang/lib/Format/ContinuationIndenter.cpp at the conservation logic referenced in the issue, and trace how it interacts with BreakAfterOpenBracketIf and ContinuationIndentWidth. The work is done when the shown condition is formatted with a break immediately after the opening bracket and before the closing bracket, without regressing the related formatting behavior.

Written by the indexing model from the issue text.