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feat(dashboard): display Feed Expiration as weeks+days instead of raw days

Changed the unit from 'd' (days) to 'dtdurations' and multiplied the
PromQL queries by 86400 to convert days to seconds. Grafana's dtdurations
unit auto-formats this into human-readable 'X wk Y d' format.

Thresholds updated to seconds equivalents:
  - Red: < 7 days (604800s)
  - Yellow: 7-30 days
  - Green: > 30 days (2592000s)

Signed-off-by: anant-shipit <anantsinghrathore97@gmail.com>