JEST: Fix flaky stock market test

[catloversg]

The stock market has a test assuming that the stock forecast (otlkMag) is always changed after each market cycle. However, in edge cases, that's not true.

Let's check the log in these actions:
https://github.com/bitburner-official/bitburner-src/actions/runs/11485607894/job/31966084518?pr=1726
https://github.com/bitburner-official/bitburner-src/actions/runs/12229503158/job/34109372108?pr=1833

Those tests failed with "Omega Software" stock (OMGA). Init value of OMGA's otlkMag is 0.5.

In each market cycle:

bitburner-src/src/StockMarket/StockMarket.tsx

Lines 289 to 297 in bf095ea

	let otlkMagChange = stock.otlkMag * av;
	if (stock.otlkMag < 5) {
	if (stock.otlkMag <= 1) {
	otlkMagChange = 1;
	} else {
	otlkMagChange *= 10;
	}
	}
	stock.cycleForecast(otlkMagChange);

bitburner-src/src/StockMarket/Stock.ts

Lines 174 to 196 in bf095ea

	cycleForecast(changeAmt = 0.1): void {
	const increaseChance = this.getForecastIncreaseChance();
	if (Math.random() < increaseChance) {
	// Forecast increases
	if (this.b) {
	this.otlkMag += changeAmt;
	} else {
	this.otlkMag -= changeAmt;
	}
	} else if (this.b) {
	// Forecast decreases
	this.otlkMag -= changeAmt;
	} else {
	this.otlkMag += changeAmt;
	}
	this.otlkMag = Math.min(this.otlkMag, 50);
	if (this.otlkMag < 0) {
	this.otlkMag *= -1;
	this.b = !this.b;
	}
	}

When otlkMag is 0.5, otlkMagChange is set to 1. After cycleForecast, otlkMag may still be 0.5.

This PR adds special tests for this case.

To test this PR, you can use this test code:

globalThis.test = () => {
  for (let i = 0; i < 100000; i++) {
    deleteStockMarket();
    initStockMarket();
    initSymbolToStockMap();

    const initialValues: Record<string, any> = {};
    for (const stockName in StockMarket) {
      const stock = StockMarket[stockName];
      if (!(stock instanceof Stock)) {
        continue;
      }
      initialValues[stock.symbol] = { ...stock };
    }

    StockMarket.lastUpdate = new Date().getTime() - 5e3;
    processStockPrices(1e9);

    let testOmegaSoftwareStock = false;
    for (const stockName in StockMarket) {
      const stock = StockMarket[stockName];
      if (!(stock instanceof Stock)) {
        continue;
      }
      const initValue = initialValues[stock.symbol];
      if (initValue.price === stock.price) {
        console.error(`Stock price is not changed. Before: ${initValue.price}. After: ${stock.price}.`);
      }
      if (initValue.otlkMag === stock.otlkMag && initValue.b === stock.b) {
        if (stock.name === LocationName.IshimaOmegaSoftware && stock.otlkMag === 0.5) {
          testOmegaSoftwareStock = true;
          continue;
        }
        console.error(
          "expected either price or otlkMag to be different: " +
            `stock: ${stockName} otlkMag: ${stock.otlkMag} b: ${stock.b}`,
        );
      }
    }

    if (!testOmegaSoftwareStock) {
      continue;
    }
    deleteStockMarket();
    initStockMarket();
    initSymbolToStockMap();
    const currentOtlkMag = StockMarket[LocationName.IshimaOmegaSoftware].otlkMag;
    let isForeCastChanged = false;
    for (let j = 0; j < 10000; j++) {
      StockMarket.lastUpdate = new Date().getTime() - 5e3;
      processStockPrices(1e9);
      if (currentOtlkMag !== StockMarket[LocationName.IshimaOmegaSoftware].otlkMag) {
        isForeCastChanged = true;
        break;
      }
    }
    if (!isForeCastChanged) {
      throw new Error(`Forecast of OMGA is not changed: ${StockMarket[LocationName.IshimaOmegaSoftware].otlkMag}`);
    }
  }
};