feat(vector): always raise file descriptor soft limit

[vparfonov]

Description

Always set VECTOR_RAISE_FD_LIMIT=true on the collector so Vector raises its soft limit to the hard limit at startup. This prevents "Too many open files" errors when monitoring large numbers of log files, without requiring user configuration.

Also fix typo and formatting

/cc @Clee2691
/assign @jcantrill

Links

• Depending on PR(s): feat(startup): add --raise-fd-limit CLI flag to raise file descriptor soft limit  ViaQ/vector#277
• Backport: feat(vector): add support for raising file descriptor limits #3311
• GitHub issue:
• JIRA: https://redhat.atlassian.net/browse/LOG-9829
• Enhancement proposal:

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[vparfonov]

/test functional-target

[jcantrill]

/approve
/lgtm

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