feat(Codecov): add storage solution

static/app/components/codecov/container/codecovParamsProvider.tsx

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+import {useEffect} from 'react';
+
+import type {CodecovContextData} from 'sentry/components/codecov/context/codecovContext';
+import {CodecovContext} from 'sentry/components/codecov/context/codecovContext';
+import {useLocalStorageState} from 'sentry/utils/useLocalStorageState';
+import {useLocation} from 'sentry/utils/useLocation';
+import useOrganization from 'sentry/utils/useOrganization';
+
+type CodecovQueryParamsProviderProps = {
+  children?: NonNullable<React.ReactNode>;
+};
+
+export default function CodecovQueryParamsProvider({
+  children,
+}: CodecovQueryParamsProviderProps) {
+  const organization = useOrganization();
+
+  const location = useLocation();
+  const [localStorageState, setLocalStorageState] = useLocalStorageState(
+    `codecov-selection:${organization.slug}`,
+    {}
+  );
+
+  useEffect(() => {
+    const validEntries = {
+      repository: location.query.repository,
+      integratedOrg: location.query.integratedOrg,
+      branch: location.query.branch,
+      codecovPeriod: location.query.codecovPeriod,
+    };
+
+    for (const [key, value] of Object.entries(validEntries)) {
+      if (!value || typeof value !== 'string') {
+        delete validEntries[key as keyof CodecovContextData];
+      }
+    }
+
+    setLocalStorageState(prev => ({
+      ...prev,
+      ...validEntries,
+    }));
+  }, [setLocalStorageState, location.query]);
+
+  // Repository, org and branch default to null as its value to the option not being selected.
+  // These only represent the unselected values and shouldn't be used when fetching backend data.
+  const params: CodecovContextData = {
+    repository:
+      typeof location.query.repository === 'string'
+        ? decodeURIComponent(location.query.repository)
+        : 'repository' in localStorageState
+          ? (localStorageState.repository as string)
+          : null,
+    integratedOrg:
+      typeof location.query.integratedOrg === 'string'
+        ? decodeURIComponent(location.query.integratedOrg)
+        : 'integratedOrg' in localStorageState
+          ? (localStorageState.integratedOrg as string)
+          : null,
+    branch:
+      typeof location.query.branch === 'string'
+        ? decodeURIComponent(location.query.branch)
+        : 'branch' in localStorageState
+          ? (localStorageState.branch as string)
+          : null,
+    codecovPeriod:
+      typeof location.query.codecovPeriod === 'string'
+        ? decodeURIComponent(location.query.codecovPeriod)
+        : 'codecovPeriod' in localStorageState
+          ? (localStorageState.codecovPeriod as string)
+          : '24h',
+  };
+
+  return <CodecovContext.Provider value={params}>{children}</CodecovContext.Provider>;
+}

static/app/components/codecov/context/codecovContext.tsx

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+import {createContext, useContext} from 'react';
+
+export type CodecovContextData = {
+  branch: string | null;
+  codecovPeriod: string | null;
+  integratedOrg: string | null;
+  repository: string | null;
+};
+
+export const CodecovContext = createContext<CodecovContextData | undefined>(undefined);
+
+export function useCodecovContext() {
+  const context = useContext(CodecovContext);
+  if (context === undefined)
+    throw new Error('useCodecovContext was called outside of CodecovProvider');
+  return context;
+}