Function backfillV2WithObsolescenceNotice

backfillV2WithObsolescenceNotice(v2Card): BackfilledV2
Takes a V2 card, and backfills every V1 fields with the obsolescence notice: "This is a V2 Character Card. Please update your frontend."

To backfill the V1 fields with the actual data, see: backfillV2

Example
```
import * as Cards from 'character-card-utils'

const v2Card = {
  spec: 'chara_card_v2',
  spec_version: '2.0',
  data: {
    name: 'Mary',
    description: '{{char}} is a woman.',
    personality: 'generous',
    scenario: '{{char}} loves {{user}}',
    first_mes: 'Hello!',
    mes_example: '',
    creator_notes: 'My first card.',
    system_prompt: '',
    post_history_instructions: 'Your message must start with the word "Sweetie".',
    alternate_greetings: ['Heeeey!'],
    character_book: undefined,
    tags: ['female', 'oc'],
    creator: 'darkpriest',
    character_version: '',
    extensions: {},
  },
}

const v2CardWithBackfilledObsolescenceNotice: Cards.BackfilledV2 = {
  name: 'This is a V2 Character Card. Please update your frontend.',
  description: 'This is a V2 Character Card. Please update your frontend.',
  personality: 'This is a V2 Character Card. Please update your frontend.',
  scenario: 'This is a V2 Character Card. Please update your frontend.',
  first_mes: 'This is a V2 Character Card. Please update your frontend.',
  mes_example: 'This is a V2 Character Card. Please update your frontend.',
  spec: 'chara_card_v2',
  spec_version: '2.0',
  data: {
    name: 'Mary',
    description: '{{char}} is a woman.',
    personality: 'generous',
    scenario: '{{char}} loves {{user}}',
    first_mes: 'Hello!',
    mes_example: '',
    creator_notes: 'My first card.',
    system_prompt: '',
    post_history_instructions: 'Your message must start with the word "Sweetie".',
    alternate_greetings: ['Heeeey!'],
    character_book: undefined,
    tags: ['female', 'oc'],
    creator: 'darkpriest',
    character_version: '',
    extensions: {},
  },
}

expect(Cards.backfillV2WithObsolescenceNotice(v2Card)).toEqual(
  v2CardWithBackfilledObsolescenceNotice
)
```
Parameters
- v2Card: {
      spec: "chara_card_v2";
      spec_version: string;
      data: {
          name: string;
          description: string;
          personality: string;
          scenario: string;
          first_mes: string;
          mes_example: string;
          creator_notes: string;
          system_prompt: string;
          post_history_instructions: string;
          alternate_greetings: string[];
          character_book?: { entries: { keys: string[]; content: string; extensions: Record<string, any>; enabled: boolean; insertion_order: number; case_sensitive?: boolean | undefined; name?: string | undefined; ... 6 more ...; position?: "before_char" | ... 1 more ... | undefined; }[]; ... 5 more ...; recursive_scanning?: boolean | undefin...;
          tags: string[];
          creator: string;
          character_version: string;
          extensions: Record<string, any>;
      };
  }
  - spec: "chara_card_v2"
    
    Identifier for the Character Card spec used. Can only be 'chara_card_v2'.
  - spec_version: string
    
    Non-breaking minor spec version. Expected to be '2.0' at this time.
  - data: {
        name: string;
        description: string;
        personality: string;
        scenario: string;
        first_mes: string;
        mes_example: string;
        creator_notes: string;
        system_prompt: string;
        post_history_instructions: string;
        alternate_greetings: string[];
        character_book?: { entries: { keys: string[]; content: string; extensions: Record<string, any>; enabled: boolean; insertion_order: number; case_sensitive?: boolean | undefined; name?: string | undefined; ... 6 more ...; position?: "before_char" | ... 1 more ... | undefined; }[]; ... 5 more ...; recursive_scanning?: boolean | undefin...;
        tags: string[];
        creator: string;
        character_version: string;
        extensions: Record<string, any>;
    }
    - name: string
    - description: string
    - personality: string
    - scenario: string
    - first_mes: string
    - mes_example: string
    - creator_notes: string
    - system_prompt: string
    - post_history_instructions: string
    - alternate_greetings: string[]
    - Optional character_book?: { entries: { keys: string[]; content: string; extensions: Record<string, any>; enabled: boolean; insertion_order: number; case_sensitive?: boolean | undefined; name?: string | undefined; ... 6 more ...; position?: "before_char" | ... 1 more ... | undefined; }[]; ... 5 more ...; recursive_scanning?: boolean | undefin...
    - tags: string[]
    - creator: string
    - character_version: string
    - extensions: Record<string, any>
Returns BackfilledV2
- Defined in src/index.ts:442

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