Fix proc info lru

[yanivagman]

1. Explain what the PR does

fix: always initialize proc_info map

In environments with a high amount of CPUs the current proc_info map
size of 10240 entries might not be enough, and gets filled quickly.
In these cases we got an error of missing proc_info entry.

A quick mitigation then will be to set a bigger map size.

The root cause of this issue is that we assume that if task_info exists
for some task in the task_info_map, then also the proc_info of the
process to which the task belongs to also has an entry in the map,
but that is not the case.

To fix this issue, add proc_info lookup and initialization in
init_program_data() function. In addition, init proc_info of the
relevant pid in case it was not found in other places.

Fix: #3914

2. Explain how to test it

To test, I changed proc_info_map size to 50, then reproduced the issue.
Then see that the issue is fixed with this change

3. Other comments

[geyslan]

To test, I changed proc_info_map size to 50, then reproduced the issue.
Then see that the issue is fixed with this change

Yes. I also tested it locally and everything worked perfectly.

[geyslan]

Looks great!