[lldb] Use const reference for range variables to improve performance (NFC) (#94840)

Cppcheck recommends using a const reference for range variables in a
for-each loop.
This avoids unnecessary copying of elements, improving performance.

Caught by cppcheck -
lldb/source/API/SBBreakpoint.cpp:717:22: performance: Range variable
'name' should be declared as const reference. [iterateByValue]
lldb/source/API/SBTarget.cpp:1150:15: performance: Range variable 'name'
should be declared as const reference. [iterateByValue]
lldb/source/Breakpoint/Breakpoint.cpp:888:26: performance: Range
variable 'name' should be declared as const reference. [iterateByValue]
lldb/source/Breakpoint/BreakpointIDList.cpp:262:26: performance: Range
variable 'name' should be declared as const reference. [iterateByValue]

Fix #91213
Fix #91217
Fix #91219
Fix #91220