Refactor - Moves bpf_loader registration into the runtime

[Lichtso]

Problem

All built-in programs should be registered in one place in the runtime, so that they can be refactored together.
Currently the bpf_loader built-ins are registered in the ledger. This also causes lots of redundant code in the setup of many tests.

Summary of Changes

• Moves the registration of bpf_loader built-ins from the ledger into the runtime.
• Removes bpf_loader built-ins registration in tests and benchmarks.
• Removes declare_builtin!() of bpf_loader built-ins.
• Removes built-ins from the SDK.

[codecov]

Codecov Report

Merging #31345 (cfc65da) into master (2dcdfff) will decrease coverage by 0.1%.
The diff coverage is 73.3%.

@@            Coverage Diff            @@
##           master   #31345     +/-   ##
=========================================
- Coverage    81.5%    81.5%   -0.1%     
=========================================
  Files         734      732      -2     
  Lines      207153   207159      +6     
=========================================
- Hits       168955   168888     -67     
- Misses      38198    38271     +73