Rename StartTime/EndTime to StartTimestamp/EndTimestamp

[bogdandrutu]

Updates #2488

Depends on #2514

[codecov]

Codecov Report

Merging #2515 (5d76f9a) into main (ba720d8) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2515      +/-   ##
==========================================
+ Coverage   91.73%   91.76%   +0.02%     
==========================================
  Files         265      265              
  Lines       15092    15092              
==========================================
+ Hits        13845    13849       +4     
+ Misses        866      863       -3     
+ Partials      381      380       -1     

Impacted Files	Coverage Δ
consumer/pdata/common.go	98.91% <ø> (-0.01%)	⬇️
...r/internal/scraper/cpuscraper/cpu_scraper_linux.go	100.00% <ø> (ø)
...l/scraper/diskscraper/disk_scraper_others_linux.go	100.00% <ø> (ø)
...al/scraper/filesystemscraper/filesystem_scraper.go	100.00% <ø> (ø)
...raper/filesystemscraper/filesystem_scraper_unix.go	100.00% <ø> (ø)
...eiver/internal/scraper/loadscraper/load_scraper.go	100.00% <ø> (ø)
...r/internal/scraper/memoryscraper/memory_scraper.go	100.00% <ø> (ø)
...rnal/scraper/memoryscraper/memory_scraper_linux.go	100.00% <ø> (ø)
...craper/processesscraper/processes_scraper_linux.go	100.00% <ø> (ø)
...scraper/processesscraper/processes_scraper_unix.go	100.00% <ø> (ø)
... and 29 more

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