Removes remaining unused accounts data len bits

[brooksprumo]

Problem

There are a few more bits of code related to accounts data meter and accounts data len during transaction processing that are now unused.

Summary of Changes

Each logical change is its own commit:

• Removes accounts data len param from InvokeContext::new()
• Removes accounts_data_len_delta field from ProcessedMessageInfo
• Removes unused accounts data len param from process_message()

[brooksprumo]

A few options here:

1. Change to pub struct ProcessedMessageInfo;, without the {}
2. Remove the struct entirely

Wdyt?

[Lichtso]

Remove it entirely

[brooksprumo]

Done in 0351a8a

[codecov]

Codecov Report

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

Comparison is base (88f8d11) 81.8% compared to head (0351a8a) 81.8%.
Report is 10 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #34732   +/-   ##
=======================================
  Coverage    81.8%    81.8%           
=======================================
  Files         824      824           
  Lines      222730   222699   -31     
=======================================
+ Hits       182293   182339   +46     
+ Misses      40437    40360   -77