feat: update eligibility rules

[mdiapenabc]

Description

• Updates eligibility rules to handle eligible_tbd and not_eligible_ip_tbd statuses in outcome steps
• Add date filtering and Ended/Closed fallback logic to Step 3, and fixes a frontend date abbreviation inconsistency.

What Changes

• Unprotect eligible_tbd and not_eligible_ip_tbd
• Step 7: eligible_tbd TO eligible, not_eligible_ip_tbd TO in_pay
• Step 9: eligible_tbd / not_eligible_ip_tbd TO not_eligible_out_of_pay
• Step 10: eligible_tbd / not_eligible_in_pay / not_eligible_ip_tbd TO over_18
• Step 3: Add date filtering — Active/Interrupted placements must have startDate prior to current month; Ended/Closed fallback checks endDate in previous month; Ended/Closed Non-Placements now route to Step 4 instead of Step 8
• Frontend: Normalize month abbreviation with Locale en-US instead of 'en-CA' to fix Sept vs Sep inconsistency across CLDR versions

[saifrazabc]

Approving for update eligibility rules.