chore: remove duplicate words in strings and comments

[rvagg]

Ref: #11940

I decided to do it wholesale instead of getting individual PRs to fix these.

Python script to find these:

import os
import re

def find_direct_duplicates(directory):
    for root, dirs, files in os.walk(directory):
        for file in files:
            if file.endswith(".go"):
                filepath = os.path.join(root, file)
                with open(filepath, 'r') as f:
                    lines = f.readlines()
                    all_duplicates = set()

                    for line in lines:
                        strings = re.findall(r'"([^"]*)"|`([^`]*)`', line)
                        texts = [text for text_group in strings for text in text_group if text]

                        comment_match = re.search(r"//(.+)", line)
                        if comment_match:
                            texts.append(comment_match.group(1))

                        for text in texts:
                            words = re.split(r'\s+', text.strip().lower())
                            duplicates = [words[i] for i in range(len(words) - 1)
                                          if words[i] == words[i + 1] and words[i].isalpha()]
                            all_duplicates.update(duplicates)

                    if all_duplicates:
                        print(f"Direct duplicates found in {filepath}: {', '.join(all_duplicates)}")

find_direct_duplicates('.')

(A collaborative effort with a couple of different LLMs).

Remainders are legit:

Direct duplicates found in ./cmd/lotus-miner/info_all.go: very
Direct duplicates found in ./curiosrc/proof/treed_build_test.go: ab
Direct duplicates found in ./extern/filecoin-ffi/bls_test.go: cats
Direct duplicates found in ./chain/events/state/predicates_test.go: to