Config-guard Event::InvoiceRequestFailed

[jkczyz]

The event cannot be generated publicly, so remove it for now to avoid users needing to handle it.

[wpaulino]

Needs doc updates to not link to Event::InvoiceRequestFailed

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (955e810) 88.99% compared to head (92e5cb6) 89.69%.
Report is 12 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2629      +/-   ##
==========================================
+ Coverage   88.99%   89.69%   +0.70%     
==========================================
  Files         112      112              
  Lines       86510    89642    +3132     
  Branches    86510    89642    +3132     
==========================================
+ Hits        76986    80402    +3416     
+ Misses       7290     7029     -261     
+ Partials     2234     2211      -23     

Files	Coverage Δ
lightning/src/events/mod.rs	30.45% <ø> (+0.64%)	⬆️
lightning/src/ln/channelmanager.rs	86.70% <100.00%> (+5.07%)	⬆️
lightning/src/ln/reload_tests.rs	96.24% <ø> (ø)
lightning/src/sign/type_resolver.rs	75.00% <ø> (ø)
lightning/src/ln/outbound_payment.rs	87.42% <75.00%> (-1.15%)	⬇️

... and 11 files with indirect coverage changes

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