Display most recent Umbra announcement time/block on receive page

[jferas]

Resolves #632

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[garyghayrat]

@jferas I feel like

1. I liked the message being on top of the receive table, so it's easier to see if you have many transactions.

2. Date/block number and the rest of the message seem to be out of order.

3. I think we can skip showing the Most recent mined block and timestamp, as it should be easy enough to lookup. Or only show it in advanced mode to make sure user rpc is working properly.

[jferas]

Fixed latest: 9114d1817cfc9403f3ea0be04bdf3ba88c633315

[github-actions[bot]]

Coverage after merging show-most-recent-announcement into master will be

81.12%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
contracts-periphery/src
UmbraBatchSend.sol	100%	100%	100%	100%
UniswapWithdrawHook.sol	81.82%	100%	66.67%	83.33%	14
umbra-js/src
ethers.ts	76.27%	100%	61.11%	100%
types.ts	50%	100%	0%	100%
umbra-js/src/classes
KeyPair.ts	98.65%	96.49%	100%	100%	31–32
RandomNumber.ts	100%	100%	100%	100%
StealthKeyRegistry.ts	100%	100%	100%	100%
TxHistoryProvider.ts	77.55%	76.47%	66.67%	79.31%	11, 11, 19–20, 31, 38, 44, 53, 57, 8
Umbra.ts	75.41%	63.69%	82.93%	82.09%	105, 135–136, 157, 229–231, 315–318, 380, 394, 401–403, 405–406, 409–410, 428, 430, 432, 432, 432, 432–433, 433, 433–435, 450, 450, 450–451, 455, 458, 478, 496–498, 585, 602, 615–616, 626–627, 640, 643–644, 674–675, 751, 755, 755, 755–758, 758, 758, 758, 758, 758, 758–759, 759, 759, 759, 759, 759, 759, 759, 759, 759, 759, 761, 761, 761–762, 765, 765, 765, 765, 765–766, 769, 778, 778, 787, 790, 790, 790–792, 805, 809, 812–813, 819–821, 828, 828, 828–831, 862, 867–868, 868–869
umbra-js/src/typechain
index.ts	70.59%	100%	37.50%	100%
umbra-js/src/typechain/factories
index.ts	100%	100%	100%	100%
umbra-js/src/typechain/factories/@openzeppelin
index.ts	100%	100%	100%	100%
umbra-js/src/typechain/factories/@openzeppelin/contracts
index.ts	100%	100%	100%	100%
umbra-js/src/typechain/factories/@openzeppelin/contracts/access
Ownable__factory.ts	50%	100%	0%	66.67%	70, 76
index.ts	50%	100%	0%	100%
umbra-js/src/typechain/factories/@openzeppelin/contracts/token
index.ts	100%	100%	100%	100%
umbra-js/src/typechain/factories/@openzeppelin/contracts/token/ERC20
ERC20__factory.ts	29.03%	0%	12.50%	47.06%	310, 314, 314, 314–315, 317, 326, 326, 326, 333, 333, 333, 336, 339, 345
IERC20__factory.ts	50%	100%	0%	66.67%	201, 204
index.ts	50%	100%	0%	100%
umbra-js/src/typechain/factories/contracts
IUmbraHookReceiver__factory.ts	50%	100%	0%	66.67%	61, 67
MockHook__factory.ts	22.58%	0%	0%	41.18%	107, 111, 111, 111–112, 114, 121, 121, 121, 126, 126, 126, 129, 132, 138, 144
StealthKeyRegistry__factory.ts	22.58%	0%	0%	41.18%	202, 206, 206, 206–207, 209, 216, 216, 216, 221, 221, 221, 224, 227, 233, 239
TestToken__factory.ts	64.52%	66.67%	50%	70.59%	329–330, 348, 351, 354, 360, 366
Umbra__factory.ts	70.97%	66.67%	62.50%	76.47%	495–496, 525, 529, 532, 538
index.ts	50%	100%	0%	100%
umbra-js/src/utils
cns.ts	50%	33.33%	50%	55%	33–36, 40, 40, 40, 40, 40–41, 44–46
constants.ts	100%	100%	100%	100%
ens.ts	36.11%	25%	33.33%	40%	25–27, 35, 56–57, 57, 57–58, 63–64, 66, 70, 70, 70, 70, 70–71, 75–77
utils.ts	76.67%	68.66%	76.92%	82%	109–111, 113–115, 121, 139–140, 169, 190, 246, 253–260, 260, 260, 260, 260, 260, 260–261, 263, 294, 296–297, 306, 306, 306–307, 309, 312, 321–322, 363, 380, 380, 380, 400, 429, 431, 436, 448, 448–449, 454, 456–457, 468–472, 478, 480, 522–523, 523, 523–525, 525, 525, 536, 59–60, 779–780, 792–793, 85, 93, 93
umbra-js/test
testPrivateKeys.ts	100%	100%	100%	100%
utils.ts	100%	100%	100%	100%