Fixes in import-db for rc/v1.6.0

[iulianpascalau]

Reasoning behind the pull request

• during import-db, on metachain node, the peer state trie size increased continuously
• during import-db, we had warnings like wrong assertion type when creating peer authentication requester

Proposed changes

• call the trieStorageManager.ExitPruningBufferingMode() in the earlySnapshotCompletion function. Skip the waiting for new epoch in case the node is in import-db mode in function waitForStorageEpochChange.

Testing procedure

• standard system test
• import-db

Pre-requisites

Based on the Contributing Guidelines the PR author and the reviewers must check the following requirements are met:

• was the PR targeted to the correct branch?
• if this is a larger feature that probably needs more than one PR, is there a feat branch created?
• if this is a feat branch merging, do all satellite projects have a proper tag inside go.mod?

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.04% ⚠️

Comparison is base (9986b2e) 80.07% compared to head (b0a39d7) 80.03%.
Report is 1 commits behind head on rc/v1.6.0.

❗ Current head b0a39d7 differs from pull request most recent head 6122d86. Consider uploading reports for the commit 6122d86 to get more accurate results

Additional details and impacted files

@@              Coverage Diff              @@
##           rc/v1.6.0    #5522      +/-   ##
=============================================
- Coverage      80.07%   80.03%   -0.04%     
=============================================
  Files            708      708              
  Lines          93692    93696       +4     
=============================================
- Hits           75021    74994      -27     
- Misses         13321    13351      +30     
- Partials        5350     5351       +1     

Files Changed	Coverage Δ
state/snapshotsManager.go	97.45% <100.00%> (+0.90%)	⬆️

... and 4 files with indirect coverage changes

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[gabi-vuls]

Normal allin test: v1.5.13-dev-config-8c685c8e00 -> fixes-import-db-2023.08.24-e194f576f4

--- Specific errors ---

block hash does not match 7464
wrong nonce in block 2451
miniblocks does not match 0
num miniblocks does not match 0
miniblock hash does not match 0
block bodies does not match 0
receipts hash missmatch 0

/------/

--- Statistics ---

Nr. of all ERRORS: 1
Nr. of all WARNS: 169
Nr. of new ERRORS: 0
Nr. of new WARNS: 1
Nr. of PANICS: 0