ref(perf): Clean up measurements (#49223)

### Summary
Quickly added a check for performance marks which always excluded the
final vcd end mark, it appears that transaction using the imported
function doesn't always work so switched to Sentry.getActiveTransaction
since that should be the canonical way of accessing the active
transactions. Finally, modified the field checked for decoded body size
so we properly add up the resources encoded body size.

static/app/utils/performanceForSentry.tsx

@@ -16,8 +16,6 @@ import {
 import {useLocation} from 'sentry/utils/useLocation';
 import usePrevious from 'sentry/utils/usePrevious';
 
-import getCurrentSentryReactTransaction from './getCurrentSentryReactTransaction';
-
 const MIN_UPDATE_SPAN_TIME = 16; // Frame boundary @ 60fps
 const WAIT_POST_INTERACTION = 50; // Leave a small amount of time for observers and onRenderCallback to log since they come in after they occur and not during.
 const INTERACTION_TIMEOUT = 2 * 60_000; // 2min. Wrap interactions up after this time since we don't want transactions sticking around forever.
@@ -29,7 +27,7 @@ const ASSET_OUTLIER_VALUE = 1_000_000_000; // Assets over 1GB are ignored since
  * This will return an interaction-type transaction held onto by a class static if one exists.
  */
 export function getPerformanceTransaction(): IdleTransaction | Transaction | undefined {
-  return PerformanceInteraction.getTransaction() ?? getCurrentSentryReactTransaction();
+  return PerformanceInteraction.getTransaction() ?? Sentry.getActiveTransaction();
 }
 
 /**
@@ -66,7 +64,7 @@ export class PerformanceInteraction {
 
   static startInteraction(name: string, timeout = INTERACTION_TIMEOUT, immediate = true) {
     try {
-      const currentIdleTransaction = getCurrentSentryReactTransaction();
+      const currentIdleTransaction = Sentry.getActiveTransaction();
       if (currentIdleTransaction) {
         // If interaction is started while idle still exists.
         currentIdleTransaction.setTag('finishReason', 'sentry.interactionStarted'); // Override finish reason so we can capture if this has effects on idle timeout.
@@ -186,7 +184,7 @@ export function VisuallyCompleteWithData({
       return;
     }
     try {
-      const transaction: any = getCurrentSentryReactTransaction(); // Using any to override types for private api.
+      const transaction: any = Sentry.getActiveTransaction(); // Using any to override types for private api.
       if (!transaction) {
         return;
       }
@@ -200,12 +198,18 @@ export function VisuallyCompleteWithData({
           if (!browserPerformanceTimeOrigin) {
             return;
           }
-          const startMark = performance.getEntriesByName(`${id}-vcds-start`)[0];
-          const endMark = performance.getEntriesByName(`${id}-vcds-end`)[0];
+          performance.mark(`${id}-vcsd-end`);
+          const startMarks = performance.getEntriesByName(`${id}-vcds-start`);
+          const endMarks = performance.getEntriesByName(`${id}-vcds-end`);
+          if (startMarks.length > 1 || endMarks.length > 1) {
+            transaction.setTag('vcd_extra_recorded_marks', true);
+          }
+
+          const startMark = startMarks.at(-1);
+          const endMark = endMarks.at(-1);
           if (!startMark || !endMark) {
             return;
           }
-          performance.mark(`${id}-vcsd-end`);
           performance.measure(
             `VCD [${id}] #${num.current}`,
             `${id}-vcsd-start`,
@@ -262,7 +266,7 @@ const addAssetMeasurements = (transaction: TransactionEvent) => {
   const getEncodedSize = data =>
     data['http.response_content_length'] ?? data['Encoded Body Size'] ?? 0;
   const getDecodedSize = data =>
-    data['http.decoded_request_body_length'] ?? data['Decoded Body Size'] ?? 0;
+    data['http.decoded_response_content_length'] ?? data['Decoded Body Size'] ?? 0;
   const getFields = data => ({
     operation: getOperation(data),
     transferSize: getTransferSize(data),
@@ -274,8 +278,11 @@ const addAssetMeasurements = (transaction: TransactionEvent) => {
     const filtered = spans.filter(
       s =>
         s.op === op &&
-        SENTRY_ASSET_DOMAINS.every(
-          domain => !s.description || s.description.includes(domain)
+        SENTRY_ASSET_DOMAINS.some(
+          domain =>
+            !s.description ||
+            s.description.includes(domain) ||
+            s.description.startsWith('/')
         )
     );
     const transfered = filtered.reduce((acc, curr) => {