test: add check for base description length

[MuckT]

Description

After merging #542 it became clear that some of our dapp descriptions where not matching the expectations set out in adding-new-dapps specifically, "Dapp descriptions must be 50 characters or less...". This PR adds a check for the dapp description in the base.json; we may want to relax this limit.

The dapps with descriptions which are above 50 characters are listed below:

{
  "bidali": "Use your crypto to purchase gift cards from brands worldwide",
  "ethichub": "Lend capital to unbanked farmers through DeFi crowdfunding",
  "halofi": "Be your best financial self. Hit your goals to get rewarded",
  "hedgey": "Empower your team and investors with on-chain token vesting",
  "immortalx": "Trade crypto with low fees directly from your wallet, with up to 50x leverage",
  "impactmarket": "Donate, stake, and collect $PACT while empowering underserved communities",
  "ipermatch": "Collect NFT footballers and be the manager of YOUR team",
  "llamaswap": "Find the best route for your trade giving you the best execution prices in DeFi", 
  "masa": "Claim a free .celo domain, refer friends and earn rewards",
  "moola": "Lend, borrow, or pool your crypto while getting rewards",
  "sarafu": "Create, use and explore Community Asset Vouchers with Grassroots Economics",
  "staked-celo": "Stake CELO and get rewards while keeping your crypto liquid",
  "talentprotocol": "Where builders commit to goals, share their progress and find the support they need to succeed",
  "toucan": "Use your crypto to create carbon credits for climate action"
}